Build a docker image with GDK installed for use in GitLab E2E tests

What does this merge request do and why?

This allows us to create a docker image with GDK installed for use in running e2e tests in the GitLab project. See gitlab-org/quality/quality-engineering&4 (closed). The image is being used in gitlab!109286 (merged)

Taken almost entirely from !2799 (merged)

Closes #1605 (closed)

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.