bugfix(ci): derive.yml concurrency cancels sibling dispatches (closes #364) - #365
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…loses #364) The legacy group ``derive-{repo}-budget`` covered ALL derive dispatches against a repo. Combined with GHA's "at most one pending per group" rule under ``cancel-in-progress: false``, firing three resize dispatches in quick succession (1k→512, 1k→256, 1k→128) cancels the middle one: the third displaces the second's pending slot before it can start. Hit during the v2026.04.99-tst-full chain — the 256 resize cancelled 4s after dispatch with no jobs ever starting (run 25530375206). Same hazard would bite ktx2-1k vs ktx2-512 dispatched together. Fix: include kind/source-tier/target-tier in the concurrency group key. Distinct-purpose dispatches now run in parallel; same-purpose double-dispatch still serializes because that case shares the key.
gerchowl
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…loses #364) (#365) The legacy group ``derive-{repo}-budget`` covered ALL derive dispatches against a repo. Combined with GHA's "at most one pending per group" rule under ``cancel-in-progress: false``, firing three resize dispatches in quick succession (1k→512, 1k→256, 1k→128) cancels the middle one: the third displaces the second's pending slot before it can start. Hit during the v2026.04.99-tst-full chain — the 256 resize cancelled 4s after dispatch with no jobs ever starting (run 25530375206). Same hazard would bite ktx2-1k vs ktx2-512 dispatched together. Fix: include kind/source-tier/target-tier in the concurrency group key. Distinct-purpose dispatches now run in parallel; same-purpose double-dispatch still serializes because that case shares the key.
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