修改镜像拉取策略
修改配置文件：/etc/gitlab-runner/config.toml 在对应 runner 节点下添加 pull_policy = "if-not-present" 就可以了
[[runners]]
name = "Android Build Runner"
url = "https://git.xyser.com/"
token = "3dc54666cacafd************e"
executor = "docker"
[runners.docker]
tls_verify = false
image = "alpine:latest"
privileged = false
disable_cache = false
volumes = ["/cache"]
shm_size = 0
// 加入这行
pull_policy = "if-not-present"
[runners.cache]
