[pulsarbot] Handle bug in "/pulsarbot rerun-failure-checks" that reruns obsolete jobs #33
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Motivation
Currently "/pulsarbot rerun-failure-checks" might rerun obsolete jobs. The jobs to rerun are searched by the PR's head commit SHA. If the PR is closed and re-opened or the complete workflow is re-run, the PR head commit SHA doesn't change.
Only the most recent job of each unique workflow should be considered for rerunning.
Modifications
Additional context
dev mailing list thread https://lists.apache.org/thread/n05xp17krb4f3cc0jjkh65ytqk1w6130