[maintenance][packaging] Integrate Packit with an upstream RPM spec

[webknjaz]

ISSUE TYPE

• Feature Idea

SUMMARY

I think we should have an upstream RPM spec to better understand the packaging issues that may arise in envs where the users rely on dnf to install the navigator. Especially, in the light of #503.
There's a Red Hat lead project called Packit that simplifies building RPMs for different OSs and they also have a GitHub App that essentially implements a CI for running this in the cloud. Let's consider using it!
I'm currently getting experience integrating it into several projects, so over time, I'll be able to do that here too.