Support home-based mailboxes during automated upgrades

tools/build-update-package.py

@@ -46,7 +46,7 @@ def build(output, version):
 set -Eeuo pipefail
 umask 077
 if [[ ${{1:-}} == --help ]]; then
-  echo 'Usage: sudo bash app-backup-update-{version}.run [--foreground] [--config FILE] [--rclone-config FILE] [--enable-gitea | --no-gitea] [--cron-services UNIT,...] [--install-deps]'
+  echo 'Usage: sudo bash app-backup-update-{version}.run [--foreground] [--config FILE] [--rclone-config FILE] [--enable-gitea | --no-gitea] [--cron-services UNIT,...] [--mail-dir DIR | --mail-homes-only] [--install-deps]'
   exit 0
 fi
 [[ $EUID == 0 ]] || {{ echo 'Bitte mit sudo bash starten.' >&2; exit 1; }}