docker加速器列表

不推荐ali加速器，原因是比较更新太慢

"registry-mirrors": [
    "https://hub-mirror.c.163.com",
    "https://mirror.baidubce.com",
    "https://registry.docker-cn.com",
    "https://reg-mirror.qiniu.com",
    "https://dockerhub.azk8s.cn",
    "https://docker.mirrors.ustc.edu.cn"
  ]