[build2] build2 Action for GitHub Workflows

[Boris Kolpackov]

Fabian Meyer <fabian.meyer at posteo.de> writes:

> I renamed the repository to "setup-build2-github-action".

Perfect, thanks!


> However, I still cannot create a release on the GitHub Marketplace. I think
> the organization "build2" has to agree to the GitHub Marketplace Developer
> Agreement, it's not repo specific.
> Could you do that?

Done. Let me know if there is anything else I can help with.