services:
  watchtower:
    image: containrrr/watchtower
    restart: unless-stopped
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      WATCHTOWER_INCLUDE_STOPPED: true
      WATCHTOWER_MONITOR_ONLY: false
      WATCHTOWER_SCHEDULE: "0 0 4 * * *"
      WATCHTOWER_WARN_ON_HEAD_FAILURE: "never"
      WATCHTOWER_NOTIFICATIONS: "shoutrrr"
      WATCHTOWER_NOTIFICATION_URL: "mattermost://watchtower@cs-mm.ddnss.de/og4ckuqet7fafb8kjuaigzuh7c"
      WATCHTOWER_NOTIFICATION_TEMPLATE: "{{range .}} ASU - {{.Time.Format \"2006-01-02 15:04:05\"}} ({{.Level}}): {{.Message}}{{println}}{{end}}"