Implement Gitea API for build status

[Thesola10]

Gitea is a lightweight, self-hosted Github-like app which, unlike Gitlab, does not come with a builtin CI, but it does have the proper endpoints for setting build status and creating webhooks.

Wouldn't it be nice if Zeus was Gitea-compatible?

[Thesola10]

API documentation can be found on any Gitea server under /api/swagger