Make rspamd an optional dependency, because rspamd is only necessary when you really care about incoming mail, is resource-heavy, and for some reason some setups cant install libhyperscan which is required by rspamd

conf/yunohost/services.yml

@@ -43,6 +43,7 @@ redis-server:
 rspamd:
   log: /var/log/rspamd/rspamd.log
   category: email
+  ignore_if_package_is_not_installed: rspamd
 slapd:
   category: database
   test_conf: slapd -Tt

debian/control

@@ -25,7 +25,7 @@ Depends: ${python3:Depends}, ${misc:Depends}
  , dnsmasq, resolvconf, libnss-myhostname
  , postfix, postfix-ldap, postfix-policyd-spf-perl, postfix-pcre
  , dovecot-core, dovecot-ldap, dovecot-lmtpd, dovecot-managesieved, dovecot-antispam
- , rspamd, opendkim-tools, postsrsd, procmail, mailutils
+ , opendkim-tools, postsrsd, procmail, mailutils
  , redis-server
  , acl
  , git, curl, wget, cron, unzip, jq, bc, at, procps
@@ -35,6 +35,7 @@ Recommends: yunohost-admin, yunohost-portal (>= 12.0)
  , bash-completion, rsyslog
  , unattended-upgrades
  , libdbd-ldap-perl, libnet-dns-perl
+ , rspamd
 Conflicts: iptables-persistent
  , apache2
  , bind9

hooks/conf_regen/31-rspamd

@@ -2,6 +2,12 @@
 
 set -e
 
+if ! dpkg --list | grep -q 'ii *rspamd '
+then
+    echo 'rspamd is not installed, skipping'
+    exit 0
+fi
+
 do_pre_regen() {
     pending_dir=$1