[Docker][Documentation] Uses correct docker image from Docker Hub (!9382) · 合并请求 · 王权利 / large

Created by: ghost

This PR uses the correct docker image from Docker Hub for the gitlab-data image.

The PR also avoids using ___ in image tag names wherever it is possible.

More information under GitLab issue #9364 (closed).

/cc @dosire.

[Docker][Documentation] Uses correct docker image from Docker Hub