cgru build pipeline #567

Hello,
I made a build pipeline based on github actions. What it does:

• when a git tag, e.g. a version 3.1.1 is pushed
• it will build full afanasy on github workers
• it will package the release files, e.g. debian deb and tar archive
• it will create a new release and upload the packaged files, e.g. https://github.com/sebastianelsner/cgru/releases

This is currently only done for ubuntu and debian, you can see it here: https://github.com/sebastianelsner/cgru/actions
This will make releases go in seconds.
The question is, if you are interested in merging this, should other Linux OSes also be compiled?
I have no experience with windows, tho...