기본 Docker 컨테이너 이름을 `app` 대신 `discourse`로 변경

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If you rename your app.yml something else, it’ll use that name.

Also, there’s this setting:

  ## Uncomment if you want the container to be started with the same
  ## hostname (-h option) as specified above (default "$hostname-$config")
  #DOCKER_USE_HOSTNAME: true