使用镜像containrrr/watchtower docker-compose.yml

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version: '3'

services:
watchtower:
image: containrrr/watchtower:latest
container_name: watchtower
volumes:
- /var/run/docker.sock:/var/run/docker.sock # 访问 Docker 守护进程
restart: unless-stopped # 自动重启容器
command: --schedule "0 0 3 * * *" --cleanup # 每天凌晨 3 点执行更新,并删除旧镜像