golangci-lintまわりの修正

[H1rono]

close #795

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 25.67%. Comparing base (c2239b2) to head (e947aef).
Report is 3 commits behind head on v2.

Files with missing lines	Patch %	Lines
testutil/random/ramdom.go	20.00%	8 Missing ⚠️
service/webhook.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #796      +/-   ##
==========================================
- Coverage   25.69%   25.67%   -0.03%     
==========================================
  Files         148      148              
  Lines       26892    26892              
==========================================
- Hits         6910     6904       -6     
- Misses      19106    19112       +6     
  Partials      876      876              

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