CI: fix condition on which reformats are re-committed #66
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Fixes the issue described at #65 (comment)
If you look through the logs you can see all the git commands that were run in CI. If I emulate those locally I can repro the problem. The old command exit coded 1, even with a clean working tree.
I think what the problem was: actions/checkout uses a fetch-depth of 0, so we only get the most recent commit. So comparing vs HEAD didn't work. But not sure about this. All I know is that this new command works in that test environment, and in my normal dev repo. It's a more common git command too, so that is nice.