Build Cache Optimization

[kwitsch]

Changes:

• use bind mounts instead of COPY in Dockerfile
• layer cache optimization during Docker build
• preload go modules in makefile workflow for better cache usage in matrix steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.19%. Comparing base (fe84ab8) to head (c8c55f9).
Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1402      +/-   ##
==========================================
+ Coverage   93.88%   94.19%   +0.31%     
==========================================
  Files          78       78              
  Lines        6361     4894    -1467     
==========================================
- Hits         5972     4610    -1362     
+ Misses        300      194     -106     
- Partials       89       90       +1     

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[ThinkChaos]

Nice!