Push Docker images as part of the release workflow (#1037)

docker/README.md

@@ -0,0 +1,24 @@
+# NebulaOSS/nebula Docker Image
+
+## Building
+
+From the root of the repository, run `make docker`.
+
+## Running
+
+To run the built image, use the following command:
+
+```
+docker run \
+    --name nebula \
+    --network host \
+    --cap-add NET_ADMIN \
+    --volume ./config:/config \
+    --rm \
+    nebulaoss/nebula
+```
+
+A few notes:
+
+- The `NET_ADMIN` capability is necessary to create the tun adapter on the host (this is unnecessary if the tun device is disabled.)
+- `--volume ./config:/config` should point to a directory that contains your `config.yml` and any other necessary files.