For a bit of CNCF xRegistry magic:
curl -o docker-compose-gh.yml https://raw.githubusercontent.com/xregistry/xrproxy/main/docker-compose-gh.yml
docker compose -f docker-compose-gh.yml up After a little while (give it a couple minutes to settle after the images have been pulled), you'll get a metadata viewer at http://localhost:8080/viewer and an xRegistry API endpoint at http://localhost:8080/registry
What are you looking at? The viewer shows our test registry at xregistry.soaphub.org with endpoints and messages and schemas, but it also shows other metadata that illustrates why we call the registry "extensible":