Improve errors

[dgageot]

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[codecov-io]

Codecov Report

Merging #1255 into master will not change coverage.
The diff coverage is 42.1%.

@@           Coverage Diff           @@
##           master    #1255   +/-   ##
=======================================
  Coverage   42.24%   42.24%           
=======================================
  Files          96       96           
  Lines        4242     4242           
=======================================
  Hits         1792     1792           
  Misses       2276     2276           
  Partials      174      174

Impacted Files	Coverage Δ
pkg/skaffold/build/tag/custom.go	30% <0%> (ø)	⬆️
pkg/skaffold/kubernetes/client.go	0% <0%> (ø)	⬆️
pkg/skaffold/deploy/labels.go	0% <0%> (ø)	⬆️
pkg/skaffold/kubernetes/port_forward.go	40.22% <0%> (ø)	⬆️
pkg/skaffold/util/util.go	52.13% <100%> (ø)	⬆️
pkg/skaffold/build/tag/sha256.go	72.72% <100%> (ø)	⬆️
pkg/skaffold/docker/client.go	58.13% <40%> (ø)	⬆️
pkg/skaffold/runner/runner.go	49.39% <50%> (ø)	⬆️

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