Additional Windows and OSX CI test variants and collectable artifacts

[pevogam]

The Guibot project already supports Windows and OSX but doesn't have any CI test variants for these, just for major Debian-based and RHEL-based distros of multiple versions using Docker. We have to extend to these variants too (possibly without docker but using GH Actions's newly available environments) in order to better validate its stability on these systems.

We will also have to collect built packages as artifacts from all these and previous distro variants. At the very least RPM-s and DEB-s must be offered via links for download.