[CI] No actual execution in CUDA envs

[wangruohui]

No description provided.

[codecov]

Codecov Report

Merging #921 (58dcf4a) into master (fee80fd) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #921      +/-   ##
==========================================
+ Coverage   83.50%   83.51%   +0.01%     
==========================================
  Files         222      222              
  Lines       12813    12813              
  Branches     2094     2094              
==========================================
+ Hits        10699    10701       +2     
+ Misses       1784     1783       -1     
+ Partials      330      329       -1     

Flag	Coverage Δ
unittests	83.47% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...ls/components/stylegan2/generator_discriminator.py	86.14% <0.00%> (+1.20%)	⬆️

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