Re-add the certificate backup/restore hook ...

data/hooks/backup/21-conf_ynh_certs

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Exit hook on subcommand error or unset variable
+set -eu
+
+# Source YNH helpers
+source /usr/share/yunohost/helpers
+
+# Backup destination
+backup_dir="${1}/conf/ynh/certs"
+
+# Backup certificates
+ynh_backup "/etc/yunohost/certs" "$backup_dir"

data/hooks/restore/21-conf_ynh_certs

@@ -0,0 +1,7 @@
+backup_dir="$1/conf/ynh/certs"
+
+mkdir -p /etc/yunohost/certs/
+
+cp -a $backup_dir/. /etc/yunohost/certs/
+service nginx reload
+service metronome reload