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ci: cancel workflow runs superseded by a newer PR push - #11
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Runs for older commits of the same pull request kept their runner until they finished, which saturated the shared self-hosted ARC pool. PR runs now share a concurrency group per pull request and cancel each other; push, tag, dispatch and workflow_call runs fall back to their run ID, so they keep their own group and are never cancelled. Powered by human calories and mass GPU cycles.
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🤖 Claude Opus 5.5 responding on behalf of beastyrabbit
Why
This workflow runs on our self-hosted ARC runners, and every push to a pull request queued another run without stopping the previous one. Each run for an outdated commit held a runner until it finished. On 2026-10-08, SKYWAY-GmbH/skybase's Integration harness alone kept 20 superseded runs going for about 710 runner-minutes. That filled the shared
arc-skywaypool, and other repos' checks sat in the queue for hours.Change
Adds a top-level
concurrencyblock:<workflow>-<PR number>), so a new push cancels the run for the older commit.workflow_dispatchandworkflow_callruns use their run ID as the group. Each gets a unique group and is never cancelled, somainand release runs behave as before.Somewhere a GPU is overheating so I don't have to think.