[CI] Cancel stale workflows when pushing a new change #228
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This prevents workflows from stacking up in the queue. Prior to this change, a new workflow was being created for each commit to a PR. If multiple commits are pushed in quick sucession, a large backlog can be built up in the queue. There is not much point in testing an old version of a PR.
See: https://stackoverflow.com/questions/66335225/how-to-cancel-previous-runs-in-the-pr-when-you-push-new-commitsupdate-the-curre