feat: add rhel9 spec file along with its own build script

[damex]

here we add:

• rpm spec file (rhel9 and derivatives)
• build/lint script to actually build rpm package
• docs

[mrueg]

If you want rpms, can we use goreleaser to create them? https://goreleaser.com/customization/nfpm/

[damex]

If you want rpms, can we use goreleaser to create them? https://goreleaser.com/customization/nfpm/

it is using fpm. fpm is much worse solution for building rpms compared to building spec files. spec file is a self contained thing to build software with that will be packaged to an rpm while fpm just takes a config or binary or whatever and packs them in to rpm. quite different isn't it?

[mrueg]

It's using https://github.com/goreleaser/nfpm and not fpm :)

The advantage is that it'll be embedded in the release process and we don't need to have another process that might fail. At least @aauren and I won't be able to support rpm builds.

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