Add tag/branch name to build step

[dekimsey]

This exposes the name of the branch or tag that the Build Loop step is running. This helps show users what is being built (and thus a history) in the GitHub Actions view.

This would look something like:

[bjornoleh]

Thanks, that's useful!

[marionbarker]

Very nice. Adding this to my test branch.

[marionbarker]

Are you tagging the branch for your fork? I'm getting Build_Loop {branch name}, not the tag that lives at the LoopKit repo.