I basically installed a web server, php, and whipped up a quick index.php page that basically parsed /var/lib/registry/docker/registry/v2/repositories and then looped through that list in the _manifest/tags directory to get the tags. Then created it all in a simple table that had image name, tag, and the string used to pull the image to copy/paste into Kubernetes deployments.
Yes, it has a web server but as noted above, it’s not quite as easy as a web page to get the information.
Carl