feat: add rocky linux support

[MiahaCybersec]

Closes #591

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.23%. Comparing base (2602d59) to head (30e0e0d).
Report is 61 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #605      +/-   ##
==========================================
+ Coverage   32.51%   35.23%   +2.71%     
==========================================
  Files          17       18       +1     
  Lines        1621     1388     -233     
==========================================
- Hits          527      489      -38     
+ Misses       1062      867     -195     
  Partials       32       32              

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[sozercan]

@MiahaCybersec can you add test images for rocky too?
https://github.com/project-copacetic/copacetic/blob/main/integration/fixtures/test-images.json
https://github.com/project-copacetic/copacetic/blob/main/integration/fixtures/test-images-non-distroless.json (this will be removed with #570)

[sozercan]

LGTM. custom-unix tests is being flaky #609 @ashnamehrotra is investigating