pkg: Update & rework scripts

[BeryJu]

Add scripts & logic for RPM

closes #427

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 16.32%. Comparing base (b7e3de9) to head (04cc44c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #538      +/-   ##
==========================================
+ Coverage   12.84%   16.32%   +3.48%     
==========================================
  Files         147      178      +31     
  Lines        5257     6017     +760     
==========================================
+ Hits          675      982     +307     
- Misses       4500     4908     +408     
- Partials       82      127      +45     

Flag	Coverage Δ
go-integration	13.54% <ø> (?)
go-macos-15	13.20% <ø> (?)
go-ubuntu-24.04	13.25% <ø> (?)
go-ubuntu-24.04-arm	12.84% <ø> (ø)
go-windows-2025	12.34% <ø> (?)

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[authentik-automation]

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