docker 部署gitlab-runner dial unix /var/run/docker.sock: connect: permission denied

docker部署gitlab-runner，运行报如下错误：

Preparing the "docker" executorERROR: Failed to remove network for buildERROR: Preparation failed: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: dial unix /var/run/docker.sock: connect: permission denied (docker.go:863:0s)

添加 --privileged=true 在 docker run 命令中，就可以让 gitlab-runner 拥有权限 操作 docker.sock 文件