Use saas-linux-medium-amd64 runners for all Docker single builds
What does this MR do and why?
Builds upon !4399 (34834562) and adds the same tags to the Docker build jobs as well.
Not only the test jobs fail, for example, here's one that pushes to registry https://gitlab.com/gitlab-org/gitlab-docs/-/jobs/5577719725
Merge request acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this merge request.
Edited by Achilleas Pipinellis