diff --git a/image_builder b/image_builder
index fc7234b..8a136d3 100755
--- a/image_builder
+++ b/image_builder
@@ -2,6 +2,8 @@
 
 set -eu
 
+source recipes
+
 readonly CMD=${1:-help}
 readonly RELEASE=${2:-stable}
 readonly DEBIAN_VERSION=${3:-bullseye}
@@ -51,8 +53,19 @@ function main()
     fi
 }
 
+function _run_function_in_container()
+{
+    CODE=$(type $1 | sed '1,3d;$d' | sed -e "s/\$RELEASE/$RELEASE/g" -e "s/\$DEBIAN_VERSION/$DEBIAN_VERSION/g" -e "s/\$gitbranch/$gitbranch/g")
+    cat << EOF | incus exec $CONTAINER
+set -eux
+$CODE
+EOF
+}
+
 function _publish_as()
 {
+    _run_function_in_container slimify
+
     local shortname="$1"
     local alias="ynh-$shortname-$DEBIAN_VERSION-$ARCH-$RELEASE-base"
 
@@ -61,7 +74,7 @@ function _publish_as()
     local should_restart=0
 
     # If the container is running, stop it
-    if [ "$(incus info $CONTAINER | grep Status | awk '{print tolower($2)}')" = "running" ]
+    if [ "$(incus info $CONTAINER >/dev/null 2>/dev/null | grep Status | awk '{print tolower($2)}')" = "running" ]
     then
         should_restart=1
         incus stop "$CONTAINER"
@@ -84,228 +97,37 @@ function _publish_as()
 
 function rebuild_build_and_lint()
 {
-    incus info $CONTAINER >/dev/null && incus delete $CONTAINER --force
+    incus info $CONTAINER >/dev/null 2>/dev/null && incus delete $CONTAINER --force
     incus launch images:debian/$DEBIAN_VERSION/$ARCH $CONTAINER
     sleep 5
     $IN_CONTAINER dhclient eth0
-
-    # Needed to build and access artefacts on core CI ...
     incus file push ./gitlab-runner-light.deb $CONTAINER/root/
-    $IN_CONTAINER /bin/bash -c "apt-get update"
-    $IN_CONTAINER /bin/bash -c "DEBIAN_FRONTEND=noninteractive apt-get --assume-yes install ca-certificates git curl --no-install-recommends"
-    $IN_CONTAINER /bin/bash -c "dpkg -i /root/gitlab-runner-light.deb"
-    $IN_CONTAINER /bin/bash -c "rm /root/gitlab-runner-light.deb"
-
-    # This is for
-    # a) building .debs
-    TOOLING_APT_DEPENDENCIES="devscripts build-essential debhelper dpkg-dev dh-python wget hub"
-    TOOLING_APT_DEPENDENCIES+=" python3 python3-all python3-yaml python3-jinja2 python3-pip python-is-python3"
-    $IN_CONTAINER /bin/bash -c "apt-get update"
-    $IN_CONTAINER /bin/bash -c "DEBIAN_FRONTEND=noninteractive SUDO_FORCE_REMOVE=yes apt-get --assume-yes install $TOOLING_APT_DEPENDENCIES --no-install-recommends"
-    $IN_CONTAINER /bin/bash -c "apt-get clean"
-
-    # b) running tox, black, mypy, flake8, i18n string consistency check, bot sending PRs (actually this one is 'hub' in apt dependency right before)
-    if [[ $DEBIAN_VERSION == "bullseye" ]]
-    then
-        TOOLING_PIP_DEPENDENCIES='pyOpenSSL "tox==4.0.0" ansi2html toml "black>=22.12" jinja2 "packaging<22"'
-    else
-        TOOLING_PIP_DEPENDENCIES='pyOpenSSL "tox>=4.17" ansi2html toml "black>=24.4" jinja2 --break-system-packages'
-    fi
-    $IN_CONTAINER /bin/bash -c "PIP_NO_CACHE_DIR=1 PIP_PROGRESS_BAR='off' python3 -m pip install -U $TOOLING_PIP_DEPENDENCIES"
-
-    TOOLING_PIP_DEPENDENCIES='types-ipaddress types-enum34 types-cryptography types-toml types-requests types-PyYAML types-pyOpenSSL types-mock'
-    [[ $DEBIAN_VERSION == "bullseye" ]] || TOOLING_PIP_DEPENDENCIES+=" --break-system-packages"
-    $IN_CONTAINER /bin/bash -c "PIP_NO_CACHE_DIR=1 PIP_PROGRESS_BAR='off' python3 -m pip install -U $TOOLING_PIP_DEPENDENCIES"
-
-    # Disable mandb because zzzzz: https://stackoverflow.com/questions/69974259/fully-disable-man-db
-    $IN_CONTAINER /bin/bash -c "mv /usr/bin/mandb /usr/bin/mandb-OFF"
-    $IN_CONTAINER /bin/bash -c "cp -p /bin/true /usr/bin/mandb"
-    $IN_CONTAINER /bin/bash -c "rm -r /var/cache/man"
-    $IN_CONTAINER /bin/bash -c "rm /var/lib/man-db/auto-update"
-    $IN_CONTAINER /bin/bash -c "apt-mark hold man-db"
-
-    # Other tricks to save up space (at least 100MB or even 200MB wtf?!)
-    # https://stackoverflow.com/questions/59794891/how-does-debian-differ-from-debian-slim
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/doc"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/info"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/i18n"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/locale"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/man"
-    $IN_CONTAINER /bin/bash -c "rm -rf /var/lib/apt/lists/*"
-    $IN_CONTAINER /bin/bash -c "apt remove vim --purge --autoremove --assume-yes || true"
-
-    # Disable apt annoyances
-    $IN_CONTAINER systemctl -q disable apt-daily.timer --now
-    $IN_CONTAINER systemctl -q disable apt-daily-upgrade.timer --now
-    $IN_CONTAINER systemctl -q disable apt-daily.service --now
-    $IN_CONTAINER systemctl -q disable apt-daily-upgrade.service --now
-    $IN_CONTAINER rm -f /etc/cron.daily/apt-compat
-    $IN_CONTAINER cp /bin/true /usr/lib/apt/apt.systemd.daily
 
     ###########################################################################
-    _publish_as "build-and-lint"
+
+    _run_function_in_container build_and_lint && _publish_as "build-and-lint"
+
     ###########################################################################
 
     incus stop $CONTAINER
     incus delete $CONTAINER
 }
 
-function _dependencies_to_preinstall()
-{
-    curl https://raw.githubusercontent.com/YunoHost/yunohost/$gitbranch/debian/control 2> /dev/null | sed -n '/^Depends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | grep -v "moulinette\|ssowat\|yunohost-portal"
-    curl https://raw.githubusercontent.com/YunoHost/yunohost/$gitbranch/debian/control 2> /dev/null | sed -n '/^Recommends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | grep -v "yunohost-admin"
-    curl https://raw.githubusercontent.com/YunoHost/moulinette/$gitbranch/debian/control 2> /dev/null | sed -n '/^Depends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g"
-    # Same as above, except that all dependencies are in the same line
-    curl https://raw.githubusercontent.com/YunoHost/ssowat/$gitbranch/debian/control 2> /dev/null | grep '^Depends:' | sed 's/Depends://' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g"
-}
-
 function rebuild()
 {
-    incus info $CONTAINER >/dev/null && incus delete $CONTAINER --force
+    incus info $CONTAINER >/dev/null 2>/dev/null && incus delete $CONTAINER --force
     incus launch images:debian/$DEBIAN_VERSION/$ARCH $CONTAINER -c security.privileged=true -c security.nesting=true
-
     sleep 5
     $IN_CONTAINER dhclient eth0
-
-    # Needed to build and access artefacts on core CI ...
     incus file push ./gitlab-runner-light.deb $CONTAINER/root/
-    $IN_CONTAINER /bin/bash -c "apt update"
-    $IN_CONTAINER /bin/bash -c "DEBIAN_FRONTEND=noninteractive apt-get --assume-yes install ca-certificates git curl"
-    $IN_CONTAINER /bin/bash -c "dpkg -i /root/gitlab-runner-light.deb"
-    $IN_CONTAINER /bin/bash -c "rm /root/gitlab-runner-light.deb"
-
-    local INSTALL_SCRIPT="https://raw.githubusercontent.com/YunoHost/install_script/main/$DEBIAN_VERSION"
-
-    # Download the YunoHost install script
-    $IN_CONTAINER /bin/bash -c "curl $INSTALL_SCRIPT > install.sh"
-
-    # Disable the install of yunohost itself, because we need this for the core CI
-    $IN_CONTAINER /bin/bash -c "sed -i -E 's/(step\s+install_yunohost_packages)/#\1/' install.sh"
-    $IN_CONTAINER /bin/bash -c "sed -i -E 's/(^\s+install_yunohost_packages)/#\1/'    install.sh"
-
-    # Trick to disable restarting the service during install
-    $IN_CONTAINER /bin/bash -c "sed -i -E 's/(step\s+restart_services)/echo skip restart service #\1/' install.sh"
-    $IN_CONTAINER /bin/bash -c "echo exit 101 > /usr/sbin/policy-rc.d"
-    $IN_CONTAINER /bin/bash -c "chmod +x /usr/sbin/policy-rc.d"
-
-    # Actual install of everything...except yunohost itself
-    $IN_CONTAINER /bin/bash -c "cat install.sh | bash -s -- -a -d $RELEASE"
-
-    # To extract the dependencies, we want to retrieve the lines between "^Dependencies:" and the new line that doesn't start with a space (exclusively) . Then, we remove ",", then we remove the version specifiers "(>= X.Y)", then we add simple quotes to packages when there is a pipe (or) 'php-mysql|php-mysqlnd'.
-    $IN_CONTAINER /bin/bash -c "apt update"
-    $IN_CONTAINER /bin/bash -c "DEBIAN_FRONTEND=noninteractive SUDO_FORCE_REMOVE=yes apt-get --assume-yes install python3-all $(_dependencies_to_preinstall | tr '\n' ' ')"
-    $IN_CONTAINER /bin/bash -c "apt clean"
-
-    $IN_CONTAINER /bin/bash -c "rm /usr/sbin/policy-rc.d"
-
-    $IN_CONTAINER systemctl -q disable apt-daily.timer --now
-    $IN_CONTAINER systemctl -q disable apt-daily-upgrade.timer --now
-    $IN_CONTAINER systemctl -q disable apt-daily.service --now
-    $IN_CONTAINER systemctl -q disable apt-daily-upgrade.service --now
-    $IN_CONTAINER rm -f /etc/cron.daily/apt-compat
-    $IN_CONTAINER cp /bin/true /usr/lib/apt/apt.systemd.daily
-
-    # Disable mandb because zzzzz: https://stackoverflow.com/questions/69974259/fully-disable-man-db
-    $IN_CONTAINER /bin/bash -c "mv /usr/bin/mandb /usr/bin/mandb-OFF"
-    $IN_CONTAINER /bin/bash -c "cp -p /bin/true /usr/bin/mandb"
-    $IN_CONTAINER /bin/bash -c "rm -r /var/cache/man"
-    $IN_CONTAINER /bin/bash -c "rm /var/lib/man-db/auto-update"
-    $IN_CONTAINER /bin/bash -c "apt-mark hold man-db"
-
-    # Other tricks to save up space (at least 100MB or even 200MB wtf?!)
-    # https://stackoverflow.com/questions/59794891/how-does-debian-differ-from-debian-slim
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/doc"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/info"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/i18n"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/locale"
-    $IN_CONTAINER /bin/bash -c "rm -rf /usr/share/man"
-    $IN_CONTAINER /bin/bash -c "rm -rf /var/lib/apt/lists/*"
-    $IN_CONTAINER /bin/bash -c "apt remove vim --purge --autoremove --assume-yes || true"
-
-    # Disable services that are useless in the vast majority of cases to try to improve perfs
-    $IN_CONTAINER systemctl -q disable rspamd --now || true
-    $IN_CONTAINER systemctl -q disable dovecot --now || true
-    $IN_CONTAINER systemctl -q disable postsrsd --now || true
-    $IN_CONTAINER systemctl -q disable metronome --now || true
-    $IN_CONTAINER systemctl -q disable fake-hwclock.service --now || true
-    $IN_CONTAINER systemctl -q disable haveged.service --now || true
-    $IN_CONTAINER systemctl -q disable unattended-upgrades.service --now || true
-    $IN_CONTAINER systemctl -q disable e2scrub_all.timer --now || true
-    $IN_CONTAINER systemctl -q disable logrotate.timer --now || true
-    $IN_CONTAINER systemctl -q disable phpsessionclean.timer --now || true
-    $IN_CONTAINER systemctl -q disable systemd-tmpfiles-clean.timer --now || true
-
-    # FIXME: where does this comes from x_x / why
-    $IN_CONTAINER sed -i 's/worker_processes.*;/worker_processes 4;/g' /etc/nginx/nginx.conf
-
-    $IN_CONTAINER reboot 0
-    sleep 5
 
-    ###########################################################################
-    _publish_as "before-install"
     ###########################################################################
 
-    # Publish ynh-dev image
-    YUNOHOST_PACKAGES="yunohost yunohost-admin"
-    if [[ $DEBIAN_VERSION == "bookworm" ]]; then
-        YUNOHOST_PACKAGES+=" yunohost-portal"
-    fi
-    # Do not install vim (in recommends), just to save up space...
-    YUNOHOST_PACKAGES+=" vim-"
-    $IN_CONTAINER /bin/bash -c "apt update"
-    $IN_CONTAINER /bin/bash -c "DEBIAN_FRONTEND=noninteractive SUDO_FORCE_REMOVE=yes apt-get --assume-yes install $YUNOHOST_PACKAGES"
-    $IN_CONTAINER /bin/bash -c "apt clean"
-    $IN_CONTAINER systemctl -q disable yunohost-api --now
-    $IN_CONTAINER systemctl -q disable yunoprompt --now
-    $IN_CONTAINER /bin/bash -c "rm -rf /var/lib/apt/lists/*"
+    _run_function_in_container before_install && _publish_as "before-install"
+    _run_function_in_container dev            && _publish_as "dev"
+    _run_function_in_container appci          && _publish_as "appci"
+    _run_function_in_container core_tests     && _publish_as "core-tests"
 
-    ###########################################################################
-    _publish_as "dev"
-    ###########################################################################
-
-    local YUNO_PWD="SomeSuperStrongPassword"
-    local DOMAIN="domain.tld"
-    local SUBDOMAIN="sub.$DOMAIN"
-    local TEST_USER="package_checker"
-    local TEST_USER_DISPLAY=${TEST_USER//"_"/""}
-
-    $IN_CONTAINER yunohost tools postinstall --domain $DOMAIN --password $YUNO_PWD --username $TEST_USER --fullname "$TEST_USER_DISPLAY"
-
-    # Disable password strength check for convenience on the app CI
-    $IN_CONTAINER /bin/bash -c "echo 'admin_strength: -1' >> /etc/yunohost/settings.yml"
-    $IN_CONTAINER /bin/bash -c "echo 'user_strength: -1' >> /etc/yunohost/settings.yml"
-
-    $IN_CONTAINER yunohost domain add $SUBDOMAIN
-
-    $IN_CONTAINER /bin/bash -c "rm -rf /var/lib/apt/lists/*"
-
-    ###########################################################################
-    _publish_as "appci"
-    ###########################################################################
-
-    # Reneable default password strength check
-    $IN_CONTAINER /bin/bash -c "sed -i '/admin_strength/d' /etc/yunohost/settings.yml"
-    $IN_CONTAINER /bin/bash -c "sed -i '/user_strength/d' /etc/yunohost/settings.yml"
-
-    CORE_TESTS_APT_DEPENDENCIES="python3-pip"
-    CORE_TESTS_PIP_DEPENCENDIES='mock pip pyOpenSSL pytest pytest-cov pytest-mock pytest-sugar requests-mock "packaging<22"'
-
-    if [[ "$DEBIAN_VERSION" == "bookworm" ]]
-    then
-            # We add php8.2-cli, mariadb-client and mariadb-server to the dependencies for test_app_resources
-            CORE_TESTS_APT_DEPENDENCIES+=" php8.2-cli mariadb-client mariadb-server"
-            CORE_TESTS_PIP_DEPENCENDIES+=" --break-system-packages"
-    fi
-
-    $IN_CONTAINER /bin/bash -c "apt-get update"
-    $IN_CONTAINER /bin/bash -c "DEBIAN_FRONTEND=noninteractive SUDO_FORCE_REMOVE=yes apt-get --assume-yes install --no-install-recommends $CORE_TESTS_APT_DEPENDENCIES"
-    $IN_CONTAINER /bin/bash -c "apt-get clean"
-    $IN_CONTAINER /bin/bash -c "PIP_NO_CACHE_DIR=1 PIP_PROGRESS_BAR='off' python3 -m pip install -U $CORE_TESTS_PIP_DEPENCENDIES"
-
-    $IN_CONTAINER /bin/bash -c "rm -rf /var/lib/apt/lists/*"
-
-    ###########################################################################
-    _publish_as "core-tests"
     ###########################################################################
 
     incus stop $CONTAINER
@@ -317,36 +139,12 @@ function update_appci()
     local BASE="ynh-dev-$DEBIAN_VERSION-$ARCH-$RELEASE-base"
     incus launch $BASE $CONTAINER -c security.privileged=true -c security.nesting=true
 
-    sleep 3
-
-    echo "nameserver 8.8.8.8" | $IN_CONTAINER tee /etc/resolv.conf
-
-    sleep 3
-
-    $IN_CONTAINER ping -c3 deb.debian.org || exit 1
-
-    $IN_CONTAINER apt-get update
-    $IN_CONTAINER apt-get dist-upgrade -y
-
-    local YUNO_PWD="SomeSuperStrongPassword"
-    local DOMAIN="domain.tld"
-    local SUBDOMAIN="sub.$DOMAIN"
-    local TEST_USER="package_checker"
-    local TEST_USER_DISPLAY=${TEST_USER//"_"/""}
-
-    # Disable password strength check
-    $IN_CONTAINER yunohost tools postinstall --domain $DOMAIN --password $YUNO_PWD --username $TEST_USER --fullname "$TEST_USER_DISPLAY"
-
-    $IN_CONTAINER /bin/bash -c "echo 'admin_strength: -1' >> /etc/yunohost/settings.yml"
-    $IN_CONTAINER /bin/bash -c "echo 'user_strength: -1' >> /etc/yunohost/settings.yml"
-
-    $IN_CONTAINER yunohost domain add $SUBDOMAIN
-
-    $IN_CONTAINER yunohost --version
+    $IN_CONTAINER apt update
+    $IN_CONTAINER apt full-upgrade --assume-yes
 
+    _run_function_in_container appci && _publish_as appci
 
     incus stop $CONTAINER
-    _publish_as "appci"
     incus delete $CONTAINER
 }
 
diff --git a/recipes b/recipes
new file mode 100755
index 0000000..17d41c5
--- /dev/null
+++ b/recipes
@@ -0,0 +1,171 @@
+#!/bin/bash
+
+function build_and_lint()
+{
+    APT_INSTALL="apt-get update && DEBIAN_FRONTEND=noninteractive apt-get --assume-yes install --no-install-recommends"
+
+    # Needed to build and access artefacts on core CI ...
+    $APT_INSTALL ca-certificates git curl
+    dpkg -i /root/gitlab-runner-light.deb
+    rm /root/gitlab-runner-light.deb
+
+    # This is for
+    # a) building .debs
+    TOOLING_APT_DEPENDENCIES="devscripts build-essential debhelper dpkg-dev dh-python wget hub"
+    TOOLING_APT_DEPENDENCIES+=" python3 python3-all python3-yaml python3-jinja2 python3-pip python-is-python3"
+    $APT_INSTALL $TOOLING_APT_DEPENDENCIES
+
+    # b) running tox, black, mypy, flake8, i18n string consistency check, bot sending PRs (actually this one is 'hub' in apt dependency right before)
+    if [[ $DEBIAN_VERSION == "bullseye" ]]
+    then
+        TOOLING_PIP_DEPENDENCIES='pyOpenSSL "tox==4.0.0" ansi2html toml "black>=22.12" jinja2 "packaging<22"'
+    else
+        TOOLING_PIP_DEPENDENCIES='pyOpenSSL "tox>=4.17" ansi2html toml "black>=24.4" jinja2 --break-system-packages'
+    fi
+    PIP_NO_CACHE_DIR=1 PIP_PROGRESS_BAR='off' python3 -m pip install -U $TOOLING_PIP_DEPENDENCIES
+
+    TOOLING_PIP_DEPENDENCIES='types-ipaddress types-enum34 types-cryptography types-toml types-requests types-PyYAML types-pyOpenSSL types-mock'
+    [[ $DEBIAN_VERSION == "bullseye" ]] || TOOLING_PIP_DEPENDENCIES+=" --break-system-packages"
+    PIP_NO_CACHE_DIR=1 PIP_PROGRESS_BAR='off' python3 -m pip install -U $TOOLING_PIP_DEPENDENCIES
+}
+
+function before_install()
+{
+    APT_INSTALL="apt-get update && DEBIAN_FRONTEND=noninteractive apt-get --assume-yes install --no-install-recommends"
+
+    # Needed to build and access artefacts on core CI ...
+    $APT_INSTALL ca-certificates git curl
+    dpkg -i /root/gitlab-runner-light.deb
+    rm /root/gitlab-runner-light.deb
+
+    # Download the YunoHost install script
+    INSTALL_SCRIPT="https://raw.githubusercontent.com/YunoHost/install_script/main/$DEBIAN_VERSION"
+    curl $INSTALL_SCRIPT > install.sh
+
+    # Disable the install of yunohost itself, because we need this for the core CI
+    sed -i -E 's/(step\s+install_yunohost_packages)/#\1/' install.sh
+    sed -i -E 's/(^\s+install_yunohost_packages)/#\1/'    install.sh
+
+    # Trick to disable restarting the service during install
+    sed -i -E 's/(step\s+restart_services)/echo skip restart service #\1/' install.sh
+    echo exit 101 > /usr/sbin/policy-rc.d
+    chmod +x /usr/sbin/policy-rc.d
+
+    # Actual install of everything...except yunohost itself
+    cat install.sh | bash -s -- -a -d $RELEASE
+
+    DEPENDENCIES_TO_PREINSTALL=$(
+        curl https://raw.githubusercontent.com/YunoHost/yunohost/$gitbranch/debian/control 2> /dev/null | sed -n '/^Depends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | grep -v "moulinette\|ssowat\|yunohost-portal";
+        curl https://raw.githubusercontent.com/YunoHost/yunohost/$gitbranch/debian/control 2> /dev/null | sed -n '/^Recommends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g" | grep -v "yunohost-admin";
+        curl https://raw.githubusercontent.com/YunoHost/moulinette/$gitbranch/debian/control 2> /dev/null | sed -n '/^Depends:/,/^\w/{//!p}' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g";
+        # Same as above, except that all dependencies are in the same line
+        curl https://raw.githubusercontent.com/YunoHost/ssowat/$gitbranch/debian/control 2> /dev/null | grep '^Depends:' | sed 's/Depends://' | sed -e "s/,//g" -e "s/[(][^)]*[)]//g" -e "s/ | \S\+//g";
+    )
+
+    # To extract the dependencies, we want to retrieve the lines between "^Dependencies:" and the new line that doesn't start with a space (exclusively) . Then, we remove ",", then we remove the version specifiers "(>= X.Y)", then we add simple quotes to packages when there is a pipe (or) 'php-mysql|php-mysqlnd'.
+    APT_INSTALL="apt-get update && DEBIAN_FRONTEND=noninteractive apt-get --assume-yes install"
+    export SUDO_FORCE_REMOVE=yes
+    $APT_INSTALL python3-all $(echo $DEPENDENCIES_TO_PREINSTALL | tr '\n' ' ')
+
+    rm /usr/sbin/policy-rc.d
+
+    # FIXME: where does this comes from x_x / why
+    sed -i 's/worker_processes.*;/worker_processes 4;/g' /etc/nginx/nginx.conf
+}
+
+function dev()
+{
+    YUNOHOST_PACKAGES="yunohost yunohost-admin"
+    if [[ $DEBIAN_VERSION == "bookworm" ]]; then
+        YUNOHOST_PACKAGES+=" yunohost-portal"
+    fi
+    # Do not install vim (in recommends), just to save up space...
+    YUNOHOST_PACKAGES+=" vim-"
+    export SUDO_FORCE_REMOVE=yes
+    APT_INSTALL="apt-get update && DEBIAN_FRONTEND=noninteractive apt-get --assume-yes install"
+    $APT_INSTALL $YUNOHOST_PACKAGES
+}
+
+function appci()
+{
+    YUNO_PWD="SomeSuperStrongPassword"
+    DOMAIN="domain.tld"
+    SUBDOMAIN="sub.$DOMAIN"
+    TEST_USER="package_checker"
+    TEST_USER_DISPLAY=${TEST_USER//"_"/""}
+
+    yunohost tools postinstall --domain $DOMAIN --password $YUNO_PWD --username $TEST_USER --fullname "$TEST_USER_DISPLAY"
+
+    # Disable password strength check for convenience on the app CI
+    echo 'admin_strength: -1' >> /etc/yunohost/settings.yml
+    echo 'user_strength: -1' >> /etc/yunohost/settings.yml
+
+    yunohost domain add $SUBDOMAIN
+}
+
+function core_tests()
+{
+    # Reneable default password strength check
+    sed -i '/admin_strength/d' /etc/yunohost/settings.yml
+    sed -i '/user_strength/d' /etc/yunohost/settings.yml
+
+    CORE_TESTS_APT_DEPENDENCIES="python3-pip"
+    CORE_TESTS_PIP_DEPENCENDIES='mock pip pyOpenSSL pytest pytest-cov pytest-mock pytest-sugar requests-mock "packaging<22"'
+
+    if [[ "$DEBIAN_VERSION" == "bookworm" ]]
+    then
+            # We add php8.2-cli, mariadb-client and mariadb-server to the dependencies for test_app_resources
+            CORE_TESTS_APT_DEPENDENCIES+=" php8.2-cli mariadb-client mariadb-server"
+            CORE_TESTS_PIP_DEPENCENDIES+=" --break-system-packages"
+    fi
+
+    APT_INSTALL="apt-get update && DEBIAN_FRONTEND=noninteractive apt-get --assume-yes install --no-install-recommends"
+    $APT_INSTALL $CORE_TESTS_APT_DEPENDENCIES
+    PIP_NO_CACHE_DIR=1 PIP_PROGRESS_BAR='off' python3 -m pip install -U $CORE_TESTS_PIP_DEPENCENDIES
+}
+
+function slimify()
+{
+    apt clean
+
+    # Disable mandb because zzzzz: https://stackoverflow.com/questions/69974259/fully-disable-man-db
+    mv /usr/bin/mandb /usr/bin/mandb-OFF
+    cp -p /bin/true /usr/bin/mandb
+    rm -r /var/cache/man
+    rm /var/lib/man-db/auto-update
+    apt-mark hold man-db
+
+    # Other tricks to save up space (at least 100MB or even 200MB wtf?!)
+    # https://stackoverflow.com/questions/59794891/how-does-debian-differ-from-debian-slim
+    rm -rf /usr/share/doc
+    rm -rf /usr/share/info
+    rm -rf /usr/share/i18n
+    rm -rf /usr/share/locale
+    rm -rf /usr/share/man
+    rm -rf /var/lib/apt/lists/*
+    apt remove vim --purge --autoremove --assume-yes || true
+
+    # Disable apt annoyances
+    systemctl -q disable apt-daily.timer --now
+    systemctl -q disable apt-daily-upgrade.timer --now
+    systemctl -q disable apt-daily.service --now
+    systemctl -q disable apt-daily-upgrade.service --now
+    rm -f /etc/cron.daily/apt-compat
+    cp /bin/true /usr/lib/apt/apt.systemd.daily
+
+    # Disable services that are useless in the vast majority of cases to try to improve perfs
+    systemctl -q disable rspamd --now || true
+    systemctl -q disable dovecot --now || true
+    systemctl -q disable postsrsd --now || true
+    systemctl -q disable metronome --now || true
+    systemctl -q disable opendkim --now || true
+    systemctl -q disable fake-hwclock.service --now || true
+    systemctl -q disable haveged.service --now || true
+    systemctl -q disable unattended-upgrades.service --now || true
+    systemctl -q disable e2scrub_all.timer --now || true
+    systemctl -q disable logrotate.timer --now || true
+    systemctl -q disable phpsessionclean.timer --now || true
+    systemctl -q disable systemd-tmpfiles-clean.timer --now || true
+    systemctl -q disable yunohost-api --now || true
+    systemctl -q disable yunoprompt --now || true
+}