Add concurrency to GitHub workflows to auto-cancel older runs. #5101
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This limits GitHub actions to only allow each workflow to have a single concurrent run per branch. The result is that pushing new changes to a PR will automatically cancel older runs, freeing up more CI instances for us to use.
Caveat: The same effect will happen on
develop
too, so if 2 PRs are merged within a short time of each other, only the newer one would have CI results. I'm not sure if this is desirable behaviour or not?