Document current deployment tactics

Adding a README including my current method for deploying. See the README for
more details. All of this is quite virgin and as such is subject to change.

docker/README.md

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+# Deployments
+
+I'm documenting how I currently deploy things.
+
+I'd like to automate this workflow as much as possible, and I intend to do just
+that. For now, I'm running things manually until I can design an generalization
+that appeals to me.
+
+## Dependencies
+- `nix-build`
+- `docker`
+- `gcloud`
+
+## Step-by-step
+
+1. Use `nix-build` to create our Docker image for Cloud Run.
+
+```shell
+> nix-build ./cloud_run.nix
+```
+
+This outputs a Docker image at `./result`.
+
+1. Load the built image (i.e. `./result`) into `docker` so that we can tag it
+   and push it to the Google Container Registry (i.e. GCR).
+
+```shell
+> sudo docker load <./result
+```
+
+1. (Optionally) Run the image locally to verify its integrity.
+
+```shell
+> sudo docker run -d <name>:<tag>
+```
+
+1. Tag and push the image to GCR.
+
+```shell
+> sudo docker tag <name>:<label> gcr.io/<google-cloud-project-id>/<name>:<latest>
+```
+
+# TODO: Prefer using a command line tool like `gcloud` for these steps.
+
+1. Visit Google Cloud Run; create a new service with "Create Service"; select
+   the uploaded Docker image from the "Container Image URL" field; click
+   "Create" to deploy.
+
+
+## Notes
+
+You may need to authorize `gcloud` by running the following:
+
+```shell
+> sudo gcloud auth login --no-launch-browser
+```
+
+You must use `sudo` here since the `docker` invocations are prefixed with `sudo`
+as well.