fix: support pull_request events that are already merged #92
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Fixes #83
When a workflow is running with the
pull_request
event, and the change is already merged on the main branch, the BASE SHA is incorrectly recovered withgit merge-base
. This is because the best common ancestor to the current commit is itself, so you always end up with the same commit SHA on BASE and HEAD.This propose following the regular path to fetch the BASE SHA if it is a
pull_request
event and its payload indicates it has already been merged.