ci: add stylecheck to golangci-lint

[snprajwal]

Fixes #127

[snprajwal]

PTAL @adrianreber

[codecov]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (bdafabc) 22.74% compared to head (6099c56) 22.74%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #128   +/-   ##
=======================================
  Coverage   22.74%   22.74%           
=======================================
  Files          95       95           
  Lines       15292    15292           
=======================================
  Hits         3478     3478           
  Misses      11514    11514           
  Partials      300      300           

Impacted Files	Coverage Δ
crit/decode-extra.go	0.00% <0.00%> (ø)
crit/decode.go	28.66% <0.00%> (ø)
crit/encode-extra.go	0.00% <0.00%> (ø)
crit/encode.go	19.16% <0.00%> (ø)
crit/utils.go	25.49% <33.33%> (ø)
crit/image.go	44.79% <50.00%> (ø)
crit/explore.go	70.16% <71.42%> (ø)
test/crit/main.go	66.23% <100.00%> (ø)

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[adrianreber]

Thanks.

Although most changes are done to internal functions this technically means this might break API. I am not aware of any external user of crit so far, so not sure if we need to increase the version to v7 for go-criu or not. I think PsTree might be the only structure which would count as API change. I think we do not need v7, but maybe we need it anyway at some point in the future. Just wanted to mention it here.

[snprajwal]

We will definitely need v0.7.0 once we merge #109, so I think we can merge this and release it with that change