ci: Update RPM dockerfile to hack around mirrorlist EOL

[tippmar-nr]

Updates RPM dockerfile to adjust urls for yum repos as per https://serverfault.com/a/1161847. This is a temporary fix until we can rebuild the RPM packaging process.

[chynesNR]

Thanks for the quick fix!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.85%. Comparing base (9cbaef3) to head (f64d5a6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2597      +/-   ##
==========================================
- Coverage   80.86%   80.85%   -0.02%     
==========================================
  Files         458      458              
  Lines       28985    28985              
  Branches     3184     3184              
==========================================
- Hits        23439    23435       -4     
- Misses       4756     4759       +3     
- Partials      790      791       +1     

Flag	Coverage Δ
Agent	81.77% <ø> (-0.02%)	⬇️
Profiler	72.59% <ø> (ø)

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see 2 files with indirect coverage changes