ci: re-enacted linting

[fredbi]

• re-enacted golangci-lint run in github action
• re-enacted codecov uploads in github action

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (e8e27ff) 62.92% compared to head (d8ccc36) 63.37%.
Report is 18 commits behind head on master.

Files	Patch %	Lines
info.go	33.33%	6 Missing and 2 partials ⚠️
responses.go	58.82%	5 Missing and 2 partials ⚠️
properties.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   62.92%   63.37%   +0.45%     
==========================================
  Files          28       30       +2     
  Lines        2058     3072    +1014     
==========================================
+ Hits         1295     1947     +652     
- Misses        593      951     +358     
- Partials      170      174       +4     

Flag	Coverage Δ
oldstable	63.37% <65.95%> (?)
stable	63.37% <65.95%> (?)

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