chore: adds vanity import check.

[jcchavezs]

This PR adds check on CI to verify vanity imports are rightfully added.

[pellared]

Have you tried to add https://github.com/jcchavezs/porto/ to https://github.com/golangci/golangci-lint?

[jmacd]

💯

[jcchavezs]

@pellared that was actually an idea but first I wanted to see this in action here.

[jcchavezs]

This is failing now on purpose. I wanted it to fail to test the setup.

[jcchavezs]

Do we need to update changelog?

[codecov]

Codecov Report

Merging #2255 (2623175) into main (28f335e) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #2255   +/-   ##
=====================================
  Coverage   72.4%   72.5%           
=====================================
  Files        168     168           
  Lines      11872   11872           
=====================================
+ Hits        8606    8609    +3     
+ Misses      3031    3029    -2     
+ Partials     235     234    -1     

Impacted Files	Coverage Δ
attribute/type_string.go	40.0% <ø> (ø)
baggage/baggage.go	98.2% <ø> (ø)
bridge/opencensus/aggregation.go	100.0% <ø> (ø)
bridge/opencensus/bridge.go	0.0% <ø> (ø)
bridge/opencensus/exporter.go	100.0% <ø> (ø)
exporters/otlp/otlpmetric/exporter.go	60.6% <ø> (ø)
exporters/otlp/otlpmetric/options.go	100.0% <ø> (ø)
...xporters/otlp/otlpmetric/otlpmetricgrpc/options.go	83.3% <ø> (ø)
exporters/otlp/otlpmetric/otlpmetrichttp/client.go	93.4% <ø> (ø)
...xporters/otlp/otlpmetric/otlpmetrichttp/options.go	100.0% <ø> (ø)
... and 8 more