We should be running gallery against a list of notable projects in a GitHub Action on any commit and any pull request.

A commit to master

It should run black twice: using the latest released version and the current master; and diff the codebases. This will allow us to identify which commit introduces some weird and unwanted formatting behavior.

A pull request

The GitHub action should also run on all PRs too but it needs to compare current master versus current PR instead of latest released version versus current master.

Note

We cannot make the GitHub action "fail" because whether a formatting change is desired or not is in the eye of the beholder.