Support for GitHub Workflow Commands

[nikeee]

GitHub actions supports putting annotations in source files during a CI run:
https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions

This can be used to highlight linter issues directly in the source.

Popular tools like eslint and biome support it and it looks like this:

Integration is fairly simple as it just requires printing special commands to stdout. To avoid breaking changes, biome is checking for the env var GITHUB_ACTIONS. If it's present and its value is true, then additional annotations are emitted.

I think it would be nice if phan would support this as well. I've built the support for biome and if its a feature you'd deem worth supporting, I'd volunteer to implement it for phan as well.

Edit:
I've created a plugin that adds support:
https://gist.github.com/nikeee/c2107b3e3d30ec8100b9fa83f1e2f4ac

Is this something that aligns with the project's goal?