This feature is unavailable for air-gapped deployments.
Coder is configured to automatically import the default registry, Docker Hub, to streamline your initial setup process.
This means that your users can create workspaces using Docker Hub images without further configuration on your part.
If you prefer a more granular experience, you can disable the importing of Docker Hub. You'll then have to manually configure registries on a per-organization basis before you can import images that can be used to create new workspaces.
To do so: