Test that images that can’t be built are not pushed

[dgageot]

Also fix inspect related tests

Signed-off-by: David Gageot david@gageot.net

[codecov-io]

Codecov Report

Merging #1729 into master will increase coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1729      +/-   ##
==========================================
+ Coverage   46.92%   47.05%   +0.12%     
==========================================
  Files         126      126              
  Lines        6178     6178              
==========================================
+ Hits         2899     2907       +8     
+ Misses       2980     2976       -4     
+ Partials      299      295       -4

Impacted Files	Coverage Δ
pkg/skaffold/build/local/docker.go	59.52% <100%> (+14.28%)	⬆️
pkg/skaffold/build/local/local.go	33.33% <0%> (+3.92%)	⬆️

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