forked from Shiloh/githaven
707ecec715
If triggered by PR, the ref should be `pull/<index>/head` instead of `repo.DefaultBranch`. And improve UI: <img width="493" alt="image" src="https://user-images.githubusercontent.com/9418365/215731280-312564f2-2450-45d0-b986-1accb0670976.png"> Related to #21937.