added new workflow

[grzegorz-k-karch]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.54%. Comparing base (4f84d57) to head (92cba3e).

Additional details and impacted files

@@                  Coverage Diff                   @@
##           feature/puzzletron_v2    #2323   +/-   ##
======================================================
  Coverage                  50.54%   50.54%           
======================================================
  Files                        711      711           
  Lines                      93059    93059           
======================================================
  Hits                       47033    47033           
  Misses                     46026    46026           

Flag	Coverage Δ
unit	29.05% <ø> (ø)

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[sylvesterkaczmarek]

This workflow step specifies both uses: actions/checkout@v6 and run:, but a GitHub Actions step cannot be both an action step and a shell step. Split checkout and docker build into separate steps; otherwise the new workflow is invalid and cannot run.