tree 471311112e04d959773da6067d1dce6c58fdbf27
parent 07242e7d1a8bab494ad3e3f18a2fbf706c1ed860
author Yijie Shen <henry.yijieshen@gmail.com> 1582344378 +0800
committer GitHub <noreply@github.com> 1582344378 -0800
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Use GITHUB_SHA for finding pr base commit (#6)

Per documentation:

GITHUB_SHA is Last merge commit on the GITHUB_REF branch
and GITHUB_REF is PR merge branch refs/pull/:prNumber/merge

Therefore, we could use GITHUB_SHA~commitNumber for pr base commit.