add backupbot

compose.yml

@@ -83,6 +83,11 @@ services:
     deploy:
       labels:
         - coop-cloud.${STACK_NAME}.db.version=5.7-dce7f54b
+        - backupbot.backup="true"
+        - backupbot.backup.pre-hook='mkdir -p /tmp/backup/ && mysqldump --single-transaction -u root -p"$$(cat /run/secrets/db_root_password)" kimai > /tmp/backup/backup.sql'
+        - backupbot.backup.post-hook="rm -rf /tmp/backup"
+        - backupbot.backup.path="/tmp/backup/"
+
 volumes:
   kimai_var:
   kimai_public: