Link an External Docker Registry to Your Project
As a project owner, you can link an external Docker registry to your project:
After verifying the credentials and the URL, the registry will be added to the
Linked External Docker Registries section. You can browse its
repositories and images from the Docker
page.

After linking a Docker registry, you can also configure a job to use it while running a build. If you update the linked Docker registry’s details, the updated information will be passed to any build jobs that use those details.