If Singularity can be "one container to rule them all," the effort of Singularity Registry is to empower researchers, academics, developers, and all users alike to share their containers.
To get started, you should read about how to set up your registry. If you want it to appear here for others to find your containers, simple add a page to the repo in the _registries folder. That's it! You can also have a registry for private use.