Extend watchtower to cleanup images and unnamed volumes.

monitoring/docker-compose.yaml

@@ -133,6 +133,8 @@ services:
     environment:
       WATCHTOWER_INCLUDE_STOPPED: true
       WATCHTOWER_MONITOR_ONLY: false
+      WATCHWOWER_CLEANUP: true
+      WATCHTOWER_REMOVE_VOLUMES: true
       WATCHTOWER_WARN_ON_HEAD_FAILURE: "never"
       WATCHTOWER_SCHEDULE: "0 20 4 * * *"
       WATCHTOWER_NOTIFICATIONS: "shoutrrr"