README: improve DigitalOcean user data config

Signed-off-by: Stephen Gutekanst <stephen@sourcegraph.com>

Author: Stephen Gutekanst

README.md

@@ -95,18 +95,25 @@ docker run -it --volume $(pwd):/index --volume ~/.doctree:/home/nonroot/.doctree
 </details>
 
 <details>
-<summary>#cloud-config</summary>
+<summary>DigitalOcean user data</summary>
 
-```
-#cloud-config
-
-runcmd:
-  - apt update -y && apt upgrade -y && apt install -y docker.io
-  - apt install -y git
-  - mkdir -p $HOME/.doctree && chown 10000:10001 -R ~/.doctree
-  - git clone https://github.com/golang/go && cd go && docker run -it --volume $(pwd):/index --volume $HOME/.doctree:/home/nonroot/.doctree --entrypoint=sh sourcegraph/doctree:latest -c "cd /index && doctree index ."
-  - docker rm -f doctree || true
-  - docker run -d --rm --name doctree -p 80:3333 --volume $HOME/.doctree:/home/nonroot/.doctree sourcegraph/doctree:latest
+```sh
+#!/bin/bash
+
+apt update -y && apt upgrade -y && apt install -y docker.io
+apt install -y git
+
+mkdir -p $HOME/.doctree && chown 10000:10001 -R $HOME/.doctree
+
+# Index golang/go repository
+git clone https://github.com/golang/go
+chown 10000:10001 -R go
+cd go
+docker run -i --volume $(pwd):/index --volume $HOME/.doctree:/home/nonroot/.doctree --entrypoint=sh sourcegraph/doctree:latest -c "cd /index && doctree index ."
+
+# Run server
+docker rm -f doctree || true
+docker run -d --rm --name doctree -p 80:3333 --volume $HOME/.doctree:/home/nonroot/.doctree sourcegraph/doctree:latest
 ```
 
 </details>