Create snapshot with current db and gitlab backups

The helper scripts that create mysql/postgres database dumps as well as the script running gitlab-backup were executed after the btrfs snapshot was taken. This resulted in stale db and gitlab backups (from last run).

Move execution of these helper scripts further up so their outputs get included in the btrfs snapshot.

roles/borg_client/templates/borg-backup.sh.j2

@@ -39,6 +39,17 @@ cleanup() {
 
 trap cleanup EXIT
 
+# Dump databases to /root/backup-{postgres,mysql} before taking a btrfs snapshot
+systemctl is-active postgresql && /usr/local/bin/backup-postgres.sh || true
+if systemctl is-active mysqld || systemctl is-active mariadb; then
+    /usr/local/bin/backup-mysql.sh || true
+fi
+
+{% if inventory_hostname == "gitlab.archlinux.org" %}
+# Create tarball backups of various GitLab directories using the official backup tool
+systemctl is-active docker && /usr/local/bin/backup-gitlab.sh
+{% endif %}
+
 if is_btrfs "$src"; then
     # List all btrfs submounts we want to backup, e.g. homedir.archlinux.org with "/ /home"
     list_of_btrfs_submounts=$(findmnt -Rl -o target,fstype,options / | grep btrfs | grep -v docker | grep -v "subvol=\/[[:alnum:]]" | cut -d ' ' -f1)
@@ -62,15 +73,6 @@ else
     backup_mountdir="$src"
 fi
 
-systemctl is-active postgresql && /usr/local/bin/backup-postgres.sh || true
-if systemctl is-active mysqld || systemctl is-active mariadb; then
-    /usr/local/bin/backup-mysql.sh || true
-fi
-
-{% if inventory_hostname == "gitlab.archlinux.org" %}
-systemctl is-active docker && /usr/local/bin/backup-gitlab.sh
-{% endif %}
-
 borg create -v --stats -C zstd \
     -e /proc \
     -e /sys \