build: add RPM release workflow

[cowbon]

Summary

• build an RPM whenever a GitHub Release is published
• upload the RPM as a release-versioned workflow artifact

Testing

• YAML parsed successfully
• git diff --check

[setrofim]

Our current rpm build is Oracle-specific, we probably shouldn't create an rpm release until we have a distro-agnostic configuration.

[cowbon]

Hi @setrofim, it's true that the current RPM spec file is designed for Oracle Linux. However, we do have debian specific configuration under deployment. Is there any blocker for enabling deb package building in Github workflows?

[setrofim]

There is no blocker for deb package building. The deb deployment isn't Debian-specific -- it should work for any distro that uses deb packages (e.g. Ubuntu).

[cowbon]

Actually Oracle Linux is RHEL-like, so in theory the same RPM can also be used for any Linux distro using RPM as the package manager

[setrofim]

We do not publish releases for services, instead, there is an automatic monthly tag. Packaging should be triggered off of that -- see time-package.yml workflow.