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Cancel CI runs of merged and closed pull requests - #5748
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The concurrency groups cancel superseded runs when a pull request gets new commits, but the runs of its last commit keep going after it is merged or closed and hold up the queue of the open pull requests. A new workflow on pull_request_target/closed cancels all unfinished pull request runs of the head commit. It never checks out the pull request's code. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Summary
Every workflow already has a concurrency group, so a new commit on a pull request cancels its older runs, and there is at most one run per workflow and branch. But once a pull request is merged or closed, the runs of its last commit keep going. With many open pull requests this holds up the queue for hours. For example, all nine runs of #5745 were still queued after it had been merged.
This adds
.github/workflows/cancel_closed_pr_runs.yml:pull_request_target/closed(which includes merged), so the token can also cancel runs of pull requests from forksactions: writeonly; it never checks out or runs pull request code, it only calls the APIpull_requestorpull_request_target. Push runs are excluded because a branch that is pushed todevelopdirectly shares the head SHA with the push runs there.As a one-off cleanup I also cancelled 111 stale queued runs by hand (merged/closed pull requests and superseded commits of open ones).
Breaking changes
None. This only changes CI; the library and its public API are unchanged.
Written by Claude Code.
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