Fix Jenkins GIT_REF for pull_request Actions - #131
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github.sha on pull_request is refs/pull/N/merge, which Jenkins never fetches (heads only). That produced "Couldn't find any revision to build." Push to main is unchanged.
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The GitHub Action was passing `github.sha` to Jenkins `GIT_REF`.
On push that SHA is on `main` and Jenkins finds it. On pull_request it is GitHub’s hidden merge commit (`refs/pull/N/merge`). Jenkins only fetches `refs/heads/*`, so checkout fails with:
`Couldn't find any revision to build`
This switches `GIT_REF` to `github.event.pull_request.head.sha` for PRs (the commit on the PR branch) and keeps `github.sha` for push.
Your Jenkins pipeline and its parameter defaults are fine. This is only the value the Action sends.