Revert "gitlab-ci: Only run docker-image stage if relevant source files change"

This reverts commit 9c23076b.

Some scenarios have come to light where this failed to ensure the docker image exists:

  • If the master branch of a forked repository is used for an MR which doesn't modify .gitlab-ci.yml, the docker-image job may not run.
  • If the docker-image job of the first pipeline in a forked repository is cancelled or fails for any reason, and .gitlab-ci.yml isn't modified for the next pipeline run.

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