This hides the actual command ran, so it's not so great.

This reverts commit a9d3ae77.

colons are a pain in the back in YAML, but it seems like the "Block
Scaler Style" works around the problem.

This was the next file in the list, and a good one to test because I
didn't write it. I removed some warnings that seemed ludicrous but
otherwise cleaned up the file to match the others.

The file list just doesn't show up

We still run the entire lint because that is not file-specific, and
will be easier to trigger.

git is not available in that silly image of theirs, so we have to make
a separate build stage to actually list the changed files, store that
in an artifact, and *then* be able to do the run only on those files.

That is quite silly. Surely there must be a better way?

Stack overflow to the rescue once again... https://stackoverflow.com/questions/45588426/how-to-execute-a-script-located-in-the-runner-from-the-ci-pipeline