Migrate images docs

What does this MR do and why?

  • Adds documentation regarding how to migrate existing container images to the GitLab Container Registry.

This relates to &5210 (closed)

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

To test skopeo:

  1. Have a container image on dockerhub
  2. Have a repository on GitLab
  3. Run the skopeo command to copy from one registry to another

MR 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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