java-openliberty: appsody build images too large

[scottkurz]

A docker images shows that a simple, default template app image from our stack (after `appsody build) is 564MB.

OTOH, for the app in this guide (which is a bit bigger even, not that that matters):
https://openliberty.io/guides/containerize.html#building-your-docker-image

the image size is 395MB.

From doing docker history ... I think the issue is the

COPY --chown=1001:0 --from=0 /project/user-app/target/* /tmp/wars/

since we're copying EVERYTHING just to copy the WAR later.

Not saying I have a better solution for the problem we were trying to solve..just opening the issue.