feat(build): add distroless docker images that build frpc and frps

[LiaoSirui]

[LiaoSirui]

@fatedier 有考虑构建镜像吗~ 我是因为在 k8s 中使用它，所以添加了了这个

[fatedier]

We already build it in docker https://github.com/fatedier/frp/tree/dev/dockerfiles

[LiaoSirui]

我看了下你们写的 dockerfile，我感觉没有必要使用 alpine，因为没有进行安全编译，所以我觉得 scratch 是更适合的

[github-actions[bot]]

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