整个配置

{
  "builder": {
    "gc": {
      "defaultKeepStorage": "20GB",
      "enabled": true
    }
  },
  "experimental": false,
  "features": {
    "buildkit": true
  },
  "registry-mirrors": [
    "https://docker.mirrors.ustc.edu.cn",
    "https://registry.docker-cn.com",
    "http://hub-mirror.c.163.com",
    "https://mirror.ccs.tencentyun.com"
  ]
}

设置后记得重启