+Use `concurrency` to ensure that only a single job or workflow using the same concurrency group will run at a time. A concurrency group can be any string or expression. The expression can only use [`github`](/actions/learn-github-actions/contexts#github-context), [`inputs`](/actions/learn-github-actions/contexts#inputs-context) and [`vars`](/actions/learn-github-actions/contexts#vars-context) contexts. For more information about expressions, see "[AUTOTITLE](/actions/learn-github-actions/expressions)."
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