ci: add versions fixture generator for Red Hat

[G-Rath]

This adds a semantic fixture generator for the Red Hat ecosystem - as this ends up being just under 2mb, I've not committed the file like the others, instead making the test suite only use it if it's actually present.

It works by leveraging rpms built-in Lua interpreter, which includes exposing the vercmp function meaning we can have rpm tell us what the result of comparing two versions are so long as there's a version of that available.

In terms of actually getting a version of rpm, that turns out to be a lot harder with Docker I assume just because CentOS & co is a less open-source-y distro vs the others; there are images, but they're all generally very big. In an interesting twist though it turns out Debian actually ships a version of rpm for building and the like - it has had it's package management abilities neutered, but that's not something we need so a simple apt install rpm gives us the dependency we need.

[G-Rath]

Semantic / generate-redhat-versions (pull_request) Successful in 15m

nice, that's a very reasonable "worst case with no cache" time given the size

(as a reminder, Debian is also pretty big typically taking 5+ minutes, but with caching it only takes ~20 seconds 😄)

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Semantic / generate-redhat-versions (pull_request) Successful in 34s

double nice - way to go caching 🥳

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.94%. Comparing base (c80f395) to head (cc321c1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1356      +/-   ##
==========================================
- Coverage   68.96%   68.94%   -0.02%     
==========================================
  Files         185      185              
  Lines       17934    17934              
==========================================
- Hits        12368    12365       -3     
- Misses       4903     4905       +2     
- Partials      663      664       +1     

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