Setup golangci-lint

[rerost]

use https://github.com/golangci/golangci-lint-action

バージョンあげた際にdeprecatedな書き方に気づきたい

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 37.53%. Comparing base (8a38db1) to head (66ad729).

Files with missing lines	Patch %	Lines
domain/issue/domain.go	0.00%	5 Missing ⚠️
cmd/cmd.go	0.00%	4 Missing ⚠️
cmd/schedule/apply.go	0.00%	1 Missing ⚠️
cmd/schedule/render.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
- Coverage   37.77%   37.53%   -0.24%     
==========================================
  Files          15       15              
  Lines         630      634       +4     
==========================================
  Hits          238      238              
- Misses        364      368       +4     
  Partials       28       28              

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