[Docker][Documentation] Uses correct docker image from Docker Hub (!9382) · Merge requests · qa-perf-testing / gitlabhq

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.

/cc @dosire.

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