I guess you're asking about the registry part (not 'pussh' command). It exposes the containerd image store as standard registry API so you can use any tools that work with regular registry to pull/push images to it.

You should be able to run unregistry as a standalone service on one of the nodes. Kubernetes uses containerd for storing images on nodes. So unregistry will expose the node's images as a registry. Then you should be able to run k8s deployments using 'unregistry.NAMESPACE:5000/image-name:tag' image. kubelets on other nodes will be pulling the image from unregistry.

You may want to take a look at https://spegel.dev/ which works similarly but was created specifically for Kubernetes.