How to use ForceScheduler to rebuild a PullRequest using from GitHubPullRequestBuilder

[markos]

Hi,
I've setup a Buildbot master + multiple workers setup that build a Pull Request on Github using multiple configurations on multiple compilers and architectures. The system sort of works, but in order to make sure it works, I'd like to avoid having to submit multiple test PRs to the project, and would like to use the ForceScheduler to just trigger a rebuild while I fix the issues.

I've added ForceScheduler for that reason, but if a PR originates from another repository (cloned) then checking out that particular branch does not work (branch not found error in git checkout phase). Is there a way to tell ForceScheduler to checkout using the PR URL instead of a branch?

Thanks