move zammad internal backups to compose overwrite

compose.backup.yml

@@ -0,0 +1,36 @@
+version: "3.8"
+services:
+  zammad-backup:
+    image: ghcr.io/zammad/zammad:6.3.1-95
+    command: ["zammad-backup"]
+    volumes:
+      - zammad-backup:/var/tmp/zammad
+      - zammad-storage:/opt/zammad/storage:ro
+    user: 0:0
+    deploy:
+      labels:
+        backupbot.backup.volumes.zammad-backup: "false"
+      restart_policy:
+        condition: on-failure
+    environment:
+      POSTGRESQL_DB: zammad_production
+      POSTGRESQL_HOST: zammad-postgresql
+      POSTGRESQL_USER: zammad
+      POSTGRESQL_PASS_FILE: /run/secrets/db_password
+      POSTGRESQL_PORT: 5432
+      # Backup settings
+      BACKUP_DIR: "/var/tmp/zammad"
+      BACKUP_TIME: "${BACKUP_TIME:-03:00}"
+      #BACKUP_SLEEP: 86400
+      HOLD_DAYS: 10
+      DOMAIN:
+    entrypoint: /custom-entrypoint.sh
+    configs:
+        - source: entrypoint
+          target: /custom-entrypoint.sh
+          mode: 0555
+    secrets:
+      - db_password
+
+volumes:
+  zammad-backup: