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docs(ci/docker_build): Add example of variable use

wldhx requested to merge wldhx/gitlab-ce:dev-docs-ci_docker_build-example_variable_use into master

What does this MR do?

Adds an example of using CI variables to avoid hardcoding registry name / project uri to "Using docker build".

Why was this MR needed?

It is a better practice than hardcoding (which the docs currently do and which breaks on forking, for instance), and one not completely obvious when one isn't quite familiar with the vars. Showcasing the better way to do things in docs sounds like a good idea.

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