Fetch both head and merge commits of "pull" refs. This would allow the CI script to first try checkout the merge commit (which is `github.sha` on PR) and only if that fails, default to checking out the PR head.
Fetch both head and merge commits of "pull" refs. This would allow the CI script to first try checkout the merge commit (which is `github.sha` on PR) and only if that fails, default to checking out the PR head.