Increase the lines displayed per parallel image build

[iamhopaul123]

From gitter: "Is it possible to increase the lines displayed per parallel image during the docker build phase? This would be helpful in debugging potential image errors"

With a potential enhancement solution:

I have a suggestion: The old output before you all added support for building multiple images in parallel was really infinitely better for the main image. Now, we have this scrolly 4-line height output for each image that's built in parallel. But in the use-case where we have 1 main image and then multiple sidecars – would it be possible to keep the output for the 1 main image like it was in the old times ... while then displaying the output for each sidecar-ed image as the scrolly 4 line thingie? Just akin to how layers display in there? Because in the world of 1 main image and multiple sidecars, there is a clear hierarchy of importance, even though they are all building in parallel.

[vskov147]

Just dropping a +1 to vote for the potential enhancement request that @iamhopaul123 added – thank you! – based on our conversation in Gitter

I think we might get the best of both worlds here if this is feasible – the very nice full output with layers for the main image, and then special layer-like things on there where sidecar images go!

[ryanc-scalegrowth]

+1, I asked the original question and it would be great to customize the docker build output to be a bit more informative. Especially with multiple docker images.

[ssyberg]

I'm just poking around trying to figure out how to see build errors that are not displaying during deploy maybe this is related... is there a suggestion here akin to a debug or verbose flag?