add docs for running via docker

src/content/docs/run/docker.mdx

@@ -0,0 +1,22 @@
+---
+title: Docker
+sidebar:
+  order: 2
+---
+
+import { Steps, Code } from '@astrojs/starlight/components';
+
+<Steps>
+
+1. create a config file (see [config](/concepts/config/))
+
+
+3. run
+
+    - <Code code="docker run -it -v/path/to/config.yaml:/app/config.yaml jwetzell/showbridge:latest --debug"/>
+
+    - see [CLI Usage](/guides/cli-usage) for more detail on flags
+    
+    - see [Docker docs](https://docs.docker.com/) for how to use docker
+
+</Steps>