Fix dockerfile lint

[johlju]

This change is 

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.73%. Comparing base (0f103f1) to head (b5ee693).
Report is 7 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   86.84%   94.73%   +7.89%     
==========================================
  Files           4        4              
  Lines          38       38              
  Branches        4        4              
==========================================
+ Hits           33       36       +3     
+ Misses          3        2       -1     
+ Partials        2        0       -2     

Flag	Coverage Δ
unittests	94.73% <ø> (+7.89%)	⬆️

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see 1 file with indirect coverage changes