feat: Detect changes using filesystem

[k4black]

No description provided.

[codecov]

Codecov Report

Merging #32 (4998b67) into main (6389346) will increase coverage by 8.17%.
Report is 13 commits behind head on main.
The diff coverage is 58.68%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   36.94%   45.11%   +8.17%     
==========================================
  Files          24       25       +1     
  Lines        1903     2088     +185     
==========================================
+ Hits          703      942     +239     
+ Misses       1200     1146      -54     

Flag	Coverage Δ
unittests	45.11% <58.68%> (+8.17%)	⬆️

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Files	Coverage Δ
checker/actions/contributing.py	0.00% <ø> (ø)
checker/course/__init__.py	100.00% <100.00%> (ø)
checker/course/config.py	100.00% <100.00%> (ø)
checker/course/schedule.py	78.78% <100.00%> (+4.17%)	⬆️
checker/exceptions.py	97.67% <100.00%> (ø)
checker/executors/__init__.py	100.00% <100.00%> (ø)
checker/executors/sandbox.py	87.77% <ø> (ø)
checker/testers/__init__.py	100.00% <100.00%> (ø)
checker/testers/cpp.py	93.40% <100.00%> (-0.15%)	⬇️
checker/testers/tester.py	95.65% <100.00%> (+5.79%)	⬆️
... and 13 more