Enable workflow dispatch for opencv-cuda-build.yaml

[eliteprox]

Add opencv-cuda-build.yaml workflow to allow manual triggering from any branch via workflow dispatch.

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[cursor]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ad301a4) to head (36b8a5e).
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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #22   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           55        55           
=========================================
  Hits            55        55           

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