doc: add github actions badge

[drazisil-codecov]

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[codecov]

Codecov Report

Merging #320 (b349bb9) into master (61b20ce) will decrease coverage by 1.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #320      +/-   ##
==========================================
- Coverage   97.67%   96.42%   -1.25%     
==========================================
  Files           3        3              
  Lines         129      140      +11     
  Branches       38       43       +5     
==========================================
+ Hits          126      135       +9     
- Misses          3        5       +2     

Flag	Coverage Δ
demo	87.50% <ø> (ø)
script	97.58% <ø> (-1.54%)	⬇️

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Impacted Files	Coverage Δ
src/buildExec.ts	97.58% <0.00%> (-1.54%)	⬇️

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