Remove unneeded build-time packages gcc and cpp

[wookasz]

Removes the gcc-12, cpp-12, and cpp from the image after build steps complete. These are unneeded and gcc-12 is getting flagged by vulnerability scans.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.05%. Comparing base (1df0d69) to head (5bcf817).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #411   +/-   ##
=======================================
  Coverage   88.05%   88.05%           
=======================================
  Files          26       26           
  Lines        1030     1030           
=======================================
  Hits          907      907           
  Misses        123      123           

Flag	Coverage Δ
3.10	74.75% <ø> (ø)
3.11	74.75% <ø> (ø)
3.8	74.61% <ø> (ø)
3.9	74.61% <ø> (ø)
integration	70.77% <ø> (ø)

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[Kilo59]

Ignore my earlier comment. I can't read a diff 😆