Merge pull request #20 from pirate/patch-2

Add docker-compose example setup

Author: myoung34

README.md

@@ -72,6 +72,33 @@ github-runner your-account/your-repo       AARGHTHISISYOURGHACTIONSTOKEN
 github-runner your-account/some-other-repo ARGHANOTHERGITHUBACTIONSTOKEN ubuntu-xenial
 ```
 
+Or `docker-compose.yml`:
+```yml
+version: '2.3'
+
+services:
+  worker:
+    build: .
+    image: myoung34/github-runner:latest
+    environment:
+      REPO_URL: https://github.com/example/repo
+      RUNNER_NAME: example-name
+      RUNNER_TOKEN: someGithubTokenHere
+      RUNNER_WORKDIR: /tmp/runner/work
+      ORG_RUNNER: true
+      ORG_NAME: example-github-org
+      LABELS: linux,x64,gpu
+    security_opt:
+      # needed on SELinux systems to allow docker container to manage other docker containers
+      - label:disable
+    volumes:
+      - '/var/run/docker.sock:/var/run/docker.sock'
+      - '/tmp/runner:/tmp/runner'
+      # note: a quirk of docker-in-docker is that this path 
+      # needs to be the same path on host and inside the container,
+      # docker mgmt cmds run outside of docker but expect the paths from within
+```
+
 ### Nomad ###
 
 ```