Remove Docker-in-Docker setup

[HeavyWombat]

Remove Docker-in-Docker setup.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.95%. Comparing base (54b47bd) to head (ffbdd24).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   65.95%   65.95%           
=======================================
  Files           1        1           
  Lines          94       94           
=======================================
  Hits           62       62           
  Misses         21       21           
  Partials       11       11           

Flag	Coverage Δ
unittests	65.95% <ø> (ø)

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