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Resolve Gitlab variables in Docker image name

username-removed-46649 requested to merge a.thieriot/gitlab-ci-multi-runner:variables-image-name into master

Attempt to solve issue #112 (closed)

Try to replace any variable placeholder in image name of the Docker Executor by the actual value.

Use case being to be able to run a build with a configuration version of it. Like, say:

  postgres:$POSTGRES_VERSION

One of the part I am not sure about is if the environment variables are resolved at that time (That all the overrides from the newest version of Gitlab are done)

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