docker-distribution: Deploy OCI image registry

We're going to need a place to store custom container images to run on
the Kubernetes cluster!

This is my first from-scratch manifest!

docker-distribution/README.md

@@ -0,0 +1,20 @@
+# Docker Distribution
+
+[Distribution][0] is the name of the official OCI image registry, originally
+published by Docker, Inc.  It provides a lightweight, albeit rather barebones,
+container image hosting platform.
+
+The registry itself only provides an HTTP API.  The third-party
+[docker-registry-ui][1] project provides a nice browser-based GUI for it.
+
+[0]: https://github.com/distribution/distribution
+[1]: https://joxit.dev/docker-registry-ui/
+
+
+## Installation
+
+Apply the manifest:
+
+```sh
+kubectl apply -f docker-distribution.yaml
+```