@kolev Yes, I believe it should be possible! I have not seen it in the wild yet, though. Feel free to send us your repo if you end up doing it.
The BlueBuild CLI README has instructions for installation and building, these should all work in CI as well. There are some args / env vars you need to pass to properly push the image to a registry (including tagging and signing). These should be covered in the `–help`, but if not, look at action.yml.
https://github.com/blue-build/cli
https://github.com/blue-build/github-action/blob/main/action.yml