chore: upgrade golangci-lint to v1.42.0 and add cache

[appleboy]

Signed-off-by: Bo-Yi Wu appleboy.tw@gmail.com

[codecov-commenter]

Codecov Report

Merging #22 (1cd80bf) into master (890e62d) will decrease coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   95.91%   95.77%   -0.15%     
==========================================
  Files           2        2              
  Lines          98      142      +44     
==========================================
+ Hits           94      136      +42     
- Misses          2        4       +2     
  Partials        2        2              

Flag	Coverage Δ
go-1.13	95.77% <ø> (?)
go-1.14	95.77% <ø> (?)
go-1.15	95.77% <ø> (?)
go-1.16	95.77% <ø> (?)
go-1.17	95.77% <ø> (?)
macos-latest	95.77% <ø> (?)
ubuntu-latest	95.77% <ø> (?)

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Impacted Files	Coverage Δ
policy.go	95.12% <0.00%> (-0.06%)	⬇️
secure.go	100.00% <0.00%> (ø)

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