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Compress PNG images during Docker build

Achilleas Pipinellis - OOO until November 25th (parental leave) requested to merge compress-img into master

To minimize the size of the Docker images, we need to compress the PNG images, which are the biggest source of adding to the size.

Closes #368 (closed)

Tested with 12.0:

git checkout compress-img
docker build -t registry.gitlab.com/gitlab-com/gitlab-docs:bootstrap -f dockerfiles/Dockerfile.bootstrap .
docker build -t registry.gitlab.com/gitlab-com/gitlab-docs:builder-onbuild -f dockerfiles/Dockerfile.builder.onbuild .
git checkout 12.0
docker build --build-arg NANOC_ENV=production --build-arg CI_COMMIT_REF_NAME=12.0 -t gitlab-docs:12.0 -f Dockerfile.12.0 .
  • Before: 112.81 MiB
  • After: 102.38 MiB

We'll need to backport those changes to the branches we want.

Edited by Achilleas Pipinellis - OOO until November 25th (parental leave)

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