Pass context when listing dependencies

[dgageot]

Fixes #1104

[codecov-io]

Codecov Report

Merging #1108 into master will not change coverage.
The diff coverage is 40%.

@@           Coverage Diff           @@
##           master    #1108   +/-   ##
=======================================
  Coverage   44.09%   44.09%           
=======================================
  Files          84       84           
  Lines        3667     3667           
=======================================
  Hits         1617     1617           
  Misses       1895     1895           
  Partials      155      155

Impacted Files	Coverage Δ
pkg/skaffold/runner/runner.go	50.2% <0%> (ø)	⬆️
pkg/skaffold/docker/image.go	59.18% <100%> (ø)	⬆️
pkg/skaffold/docker/parse.go	66.94% <100%> (ø)	⬆️
pkg/skaffold/bazel/bazel.go	91.3% <100%> (ø)	⬆️
pkg/skaffold/docker/context.go	31.03% <40%> (ø)	⬆️

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