Add common Env-Variable options to Dev Docs
Adds common options to the environment variables for docker, and
registry.
@@ -55,15 +55,14 @@ or push an image to a remote repository.
In order to use your local Docker, you may need to set the following environment variables:
```console
-$ export DOCKER=docker
+# "gcloud docker" (default) or "docker"
+$ export DOCKER=<docker>
+
+# "gcr.io/google_containers" (default), "index.docker.io", or your own registry
$ export REGISTRY=<your-docker-registry>
```
To find the registry simply run: `docker system info | grep Registry`
-Otherwise by default you will be using the [Google Cloud Platform](https://cloud.google.com/sdk/gcloud/):
-* REGISTRY=gcr.io/google_containers
-* DOCKER=gcloud docker --
-
### Nginx Controller
Build a raw server binary
