anchor.diff:  
   Another example of a production `docker-compose.yml` configuration is from the [buildkite-agent Golang source code](https://github.com/buildkite/agent):
   
  -```
  +```yml
   version: '2.1'
   services:
     agent:
  
positive.code: 
  To use the Docker plugin, add the `plugins` attribute to your command step. In this example, the `yarn` commands will be run inside a Docker container using the node:7 Docker image:
  
  ```
  steps:
    - command: yarn install && yarn run test
      plugins:
  
negative.code: 
  To run later steps in the image you have built, use the `plugins` attribute on command steps. This example runs a test suite concurrently in the `app` image that was built in the previous example:
  
  ```yml
  - name: "Docker Test %n"
    command: test.sh
    parallelism: 25
    plugins:
      docker-compose#v2.0.0:
        run: app
  ```
  
  For more examples and information on using this plugin, have a look at the [Docker Compose Plugin on GitHub](https://github.com/buildkite-plugins/docker-compose-buildkite-plugin).
  