This is no bug report, but a feature request or actually a proposal.
I'm aware that there are already several report classes available with phpcs, but I was missing one for GitHub Action workflows, that provides annotations (small boxes displayed directly on the PR files).
It turned out, that it's easy to achieve. Now I wonder, if the PHP_CodeSniffer team is interested in integrating that report type. If so, I could provide a pull request. But I'm also fine if there's no interest.
Here's a workflow where I use that report type - and the class: https://github.com/backdrop-contrib/i18n/blob/1.x-1.x/.github/misc/Github.php