ci(docs): serialize docs deploys to prevent gh-pages races#31
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Several rapid master pushes (e.g. merging a batch of PRs) each triggered a `mike deploy --push`, and the concurrent jobs raced on the gh-pages ref — the losers failed with "fetch first" / "cannot lock ref". A workflow-level concurrency group serializes deploys (cancel-in-progress: false, so each completes rather than being cancelled mid-push), so the latest content always lands and no run is rejected.
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Batch-merging PRs triggered several concurrent
mike deploy --pushruns that raced on the gh-pages ref (the losers failed with "fetch first" / "cannot lock ref"). A workflow-levelconcurrencygroup serializes them (cancel-in-progress: false so none is cancelled mid-push). The already-failed runs were re-deployed manually; this prevents recurrence.