feat: add transport option and golangci-lint

[wenchy]

• add golangci-lint
• add transport option at env level and per-request level

[codecov]

Codecov Report

Attention: Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.32%. Comparing base (788748e) to head (53ee18a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
env.go	71.42%	1 Missing and 1 partial ⚠️
response.go	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   79.17%   80.32%   +1.14%     
==========================================
  Files           6        6              
  Lines         413      432      +19     
==========================================
+ Hits          327      347      +20     
+ Misses         62       61       -1     
  Partials       24       24              

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