[mailcow] Use ofelia instead of cron daemons (wip: remove init systems)

data/Dockerfiles/dovecot/maildir_gc.sh

@@ -1,2 +1,2 @@
-#/bin/bash
+#!/bin/bash
 [ -d /var/vmail/_garbage/ ] && /usr/bin/find /var/vmail/_garbage/ -mindepth 1 -maxdepth 1 -type d -cmin +${MAILDIR_GC_TIME} -exec rm -r {} \;