Add skeleton for jib integration

[loosebazooka]

Mostly following the style of the bazel builder

• Not sure yet where to drop tests for Jib for (since there is no bazel equivalent):
  • runner.go
  • local.go
  • config.go

[dgageot]

So far, so good :-)

[loosebazooka]

So a couple of dev options?

1. Merge into a feature branch: jib-skaffold
2. Keep building like this with "unimplimented errors" until ready to go?

Any preference?

[codecov-io]

Codecov Report

Merging #1043 into master will decrease coverage by 0.08%.
The diff coverage is 25%.

@@            Coverage Diff             @@
##           master    #1043      +/-   ##
==========================================
- Coverage   40.85%   40.77%   -0.09%     
==========================================
  Files          70       72       +2     
  Lines        3084     3100      +16     
==========================================
+ Hits         1260     1264       +4     
- Misses       1699     1711      +12     
  Partials      125      125

Impacted Files	Coverage Δ
pkg/skaffold/runner/runner.go	53.76% <0%> (-1.11%)	⬇️
pkg/skaffold/build/local/local.go	56.81% <0%> (-5.69%)	⬇️
pkg/skaffold/build/local/jib.go	0% <0%> (ø)
pkg/skaffold/jib/jib.go	100% <100%> (ø)

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[dgageot]

I like option 2!

[loosebazooka]

@r2d4 @dgageot can you create a feature branch in this repo for us? jib_skaffold

[balopat]

LGTM.

[balopat]

added the feature branch and changed the PR to point to it. I really hope we don't have to keep the feature branch around long and that keeping in sync with master is going to be too painful :)

[balopat]

added PR for checking "in-syncness" of the feature branch: #1063