tests/thirdparty: add skip option

[mmcloughlin]

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[codecov-commenter]

Codecov Report

Merging #228 (703d55c) into master (6c0ed1c) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #228      +/-   ##
==========================================
- Coverage   75.52%   75.49%   -0.04%     
==========================================
  Files          58       58              
  Lines       35212    35228      +16     
==========================================
  Hits        26595    26595              
- Misses       8464     8480      +16     
  Partials      153      153              

Flag	Coverage Δ
integration	8.81% <ø> (ø)
unittests	73.15% <0.00%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
internal/github/client.go	0.00% <0.00%> (ø)
tests/thirdparty/config.go	89.18% <0.00%> (-2.48%)	⬇️

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