使用 watchtower 自動更新 docker images

services:
  your-app:
    image: your-image:latest
    # 其他應用配置...

  watchtower:
    image: containrrr/watchtower
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      - WATCHTOWER_SCHEDULE=0 0 4 * * *  # 每天凌晨4點檢查更新
      - WATCHTOWER_CLEANUP=true  # 清理舊的鏡像
      - WATCHTOWER_NOTIFICATIONS=slack  # 使用 Slack 通知
      - SLACK_HOOK_URL=https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK
    labels:
      - "com.centurylinklabs.watchtower.enable=true"
    restart: unless-stopped