services:
  watchtower:
    image: containrrr/watchtower:latest
    restart: unless-stopped
    environment:
      - WATCHTOWER_NOTIFICATIONS=email
      - WATCHTOWER_NOTIFICATION_EMAIL_FROM=${WATCHTOWER_EMAIL_FROM}
      - WATCHTOWER_NOTIFICATION_EMAIL_TO=${WATCHTOWER_EMAIL_TO}
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER=smtp.gmail.com
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=587
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=${WATCHTOWER_EMAIL_USER}
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=${WATCHTOWER_EMAIL_PASSWORD}
      - WATCHTOWER_MONITOR_ONLY=true       # notify only, no auto updates
      - WATCHTOWER_SCHEDULE=0 0 8 * * *   # check every day at 8am
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock