Hi, I created a minimal read-only registry server for k3s, I'm not sure whether you'd want this contribution, or how to include it. The k3s patch is minimal (~25 lines) and I can create a pull request, but it requires a support script to populate the registry and documentation. My change his here: https://github.com/k3s-io/k3s/compare/master...adrianmoye:k3s:ADD_REGISTRY and an example with documentation is here: https://github.com/adrianmoye/minimal-registry . If you're interested please can somebody help?