Follow-up from "docs: add docker-in-docker from registry example"
The following discussions from !31101 (merged) should be addressed:
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@eread started a discussion: 1. Add a service [alias](https://docs.gitlab.com/ee/ci/yaml/#servicesalias).
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@eread started a discussion: If you forget to set the service alias, the `docker:19.03.1` image won't find the
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@eread started a discussion: Below is an example of what your `.gitlab-ci.yml` should look like, assuming you have it configured with [TLS enabled](#tls-enabled):