Reuse GH workflows

[pietrushnic]

Most of this is copied from existing file, so we could avoid duplication: https://docs.github.com/en/actions/sharing-automations/reusing-workflows

Not a high priority, we can also leave it in issues.

I can also imagine, we would like to reuse this workflow not only in this repo, but use very similar config in e.g. coreboot or edk2 repos in the future.

Originally posted by @macpijan in #574 (comment)