actions: add go mod cache

[bergwolf]

No description provided.

[codecov-commenter]

Codecov Report

Merging #13 (a6ba9f9) into main (0f90cc5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   34.56%   34.56%           
=======================================
  Files          18       18           
  Lines        1270     1270           
=======================================
  Hits          439      439           
  Misses        760      760           
  Partials       71       71           

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[changweige]

Thanks