[Web][Restic][Dovecot][Dockerapi] Add restic backups with restore in the UI

- Scheduled, encrypted backups to S3, SFTP, REST or a local folder (new restic-mailcow container)
- Restore of mailboxes and whole domains in the UI, also deleted ones, for admins and domain admins
- Scope set by RESTIC_BACKUP_MODE in mailcow.conf (all, data, config)
- Optional backup before updates (update.sh), helper-scripts/restic.sh for a full restore

data/Dockerfiles/dovecot/docker-entrypoint.sh

@@ -282,6 +282,7 @@ chmod +x /usr/lib/dovecot/sieve/rspamd-pipe-ham \
   /usr/lib/dovecot/sieve/rspamd-pipe-spam \
   /usr/local/bin/imapsync_runner.py \
   /usr/local/bin/retention_runner.py \
+  /usr/local/bin/restore_runner.py \
   /usr/local/bin/imapsync \
   /usr/local/bin/trim_logs.sh \
   /usr/local/bin/sa-rules.sh \