Clear error message for unsupported artifact on GCB

[dgageot]

Also prepare the support for other artifacts types

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

[codecov-io]

Codecov Report

Merging #1453 into master will increase coverage by 0.14%.
The diff coverage is 85.29%.

@@            Coverage Diff             @@
##           master    #1453      +/-   ##
==========================================
+ Coverage   44.19%   44.33%   +0.14%     
==========================================
  Files         112      113       +1     
  Lines        4641     4660      +19     
==========================================
+ Hits         2051     2066      +15     
- Misses       2382     2386       +4     
  Partials      208      208

Impacted Files	Coverage Δ
pkg/skaffold/build/gcb/cloud_build.go	0% <0%> (ø)	⬆️
pkg/skaffold/build/gcb/docker.go	100% <100%> (ø)
pkg/skaffold/build/gcb/desc.go	93.75% <88.23%> (-6.25%)	⬇️

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[priyawadhwa]

LGTM, but did you mean to check in the debug.test file?

[dgageot]

No, indeed. I’ll remove it. Thanks!