add action api for artifacts upload and download.
It's related to https://github.com/go-gitea/gitea/pull/22738
Co-authored-by: Jason Song <i@wolfogre.com>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/103
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: fuxiaohei <fuxiaohei@vip.qq.com>
Co-committed-by: fuxiaohei <fuxiaohei@vip.qq.com>