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Dockerfile: utilize cache layers for faster rebuilds

Elan Ruusamäe requested to merge glensc/gitlab-development-kit:dockerfiler-layers into master

NOTE: the "--chown" COPY argument requires Docker 17.09 and up: https://github.com/moby/moby/pull/27303#issuecomment-338921602

  • ENV DEBIAN_FRONTEND noninteractive is dropped as it is not required anymore and injecting DEBIAN_FRONTEND to final image is not recommended practice.
  • nodejs/yarn are copied from node docker image

the resulting image appears to be even smaller now:

image

Edited by Elan Ruusamäe

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