Branch and Build OBS project on Pull Request
This action will branch a given OBS package and edit the url and revision
in the `_service` file.
Then it will monitor the build status and post this status via the
[Status API](https://developer.github.com/v3/repos/statuses/).
It will monitor as long there are pending builds.
If there is a failed build, it will abort and report failure.
If the timeout exceeds, it will abort and report pending.