Fix golangci-lint, use github actions

[khasanovbi]

No description provided.

[codecov]

Codecov Report

Base: 88.49% // Head: 92.34% // Increases project coverage by +3.85% 🎉

Coverage data is based on head (bf72556) compared to base (c40c22d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   88.49%   92.34%   +3.85%     
==========================================
  Files           5        5              
  Lines         113      196      +83     
==========================================
+ Hits          100      181      +81     
- Misses          7        9       +2     
  Partials        6        6              

Flag	Coverage Δ
unittests	92.34% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
paymentsystem/payment_system.go	90.41% <100.00%> (+4.99%)	⬆️
paymentsystem/prefix_range_splitter.go	89.74% <100.00%> (+3.69%)	⬆️
db.go	100.00% <0.00%> (ø)
core.go	100.00% <0.00%> (ø)
paymentsystem/length_checker.go	100.00% <0.00%> (ø)

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