github actions: improve nuitka compile

[NavidSassan]

• [ ] commits to the monitoring-plugins repo or to the lib repo should start the action
• [ ] the results should be cached, only rebuilding changed plugins (of course rebuild all if something was pushed to the libs)

on a release:

• [ ] upload the resulting zip file to download.linuxfabrik.ch

todos:

• [ ] how to handle the nuitka version (currently hardcoded)
• [ ] review compile parameters for nuitka (maybe there is a chance for improvements)