Ignore cache-from pull errors

[dgageot]

Fix #1592

[codecov-io]

Codecov Report

Merging #1604 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1604      +/-   ##
==========================================
+ Coverage   46.88%   46.93%   +0.04%     
==========================================
  Files         118      117       -1     
  Lines        5042     5039       -3     
==========================================
+ Hits         2364     2365       +1     
+ Misses       2446     2442       -4     
  Partials      232      232

Impacted Files	Coverage Δ
pkg/skaffold/build/local/docker.go	57.5% <100%> (ø)	⬆️
pkg/skaffold/build/tag/env_template.go	82.75% <100%> (+5.33%)	⬆️
pkg/skaffold/build/gcb/docker.go	100% <100%> (ø)	⬆️
pkg/skaffold/deploy/kubectl/images.go	97.91% <100%> (ø)	⬆️

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