docs: Document how to interact with docker containers.

There's some text in gitlab-ci.yml, but expand on things a bit here.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <!5510>
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  Container+Docs
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  Deploy
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