Base files on source branch in PR workflows #190
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chrisfenner
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This change undoes some earlier work to try to check out the source branch in some way. This breaks on e.g., private forks.
Instead, we "live with" the fact that in the context of a PR, HEAD is a merge commit. In this context, the source branch is HEAD^2 (parent 2) and we can just grab that commit hash and proceed.