Add GraphicsMagick to the UBI images

Jason Plumrequested to merge
ubi-graphicsmagick into master

Add GraphicsMagick to the UBI images

  1. Create a Dockerfile.build.ubi8 that generates a FROM scratch image with /assets/usr/local/* containing GraphicsMagick, statically linked.
  2. Add CI Job build:gitlab-graphics-magick
  3. Add these new assets to the Dockerfile.build.ubi8 for GitLab Rails
  4. Add the additional operational dependencies (of GraphicsMagick) to GitLab Rails Dockerfile.ubi8

Closes gitlab-org/charts/gitlab#2211 (closed)

Edited by Jason Plum

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