Feature Request: Build repos from git and add an API to do so

I would like docsrs to be able to build a crate/workspace from a provided git-link and have that ability be exposed through an API of the webserver as well. This would then be similar to /crate/name/version/rebuild but the user of the API would need to provide a git-uri too. This would be awesome to have for development internal documentation where the crate is not yet mature enough to push onto crates.io but one wants to have a nice webpage with the documentation, which has some of the docsrs features that pure rustdoc does not have, e. g., a list of all crate-features, selecting specific architecture versions of the crate etc.

Start by tracing the existing /crate/name/version/rebuild web-server API and the crate/workspace build flow. Define how a provided git URI, including development-only crates, should be validated and built, and how the API should expose the resulting documentation. Done means the design and implementation support git-based builds while preserving the documented docs.rs features for the generated page.