title: Start play framework app from dockerfile
body: <p>I want to start a play framework 2 application in a Dockerfile.</p>
  
  <p>Let us assume my play project rests in the /myapp directory in ubuntu. 
  When I start it manually, I would just say:</p>
  
  <pre><code>cd /myapp
  sbt run
  </code></pre>
  
  <p>How can I run <code>sbt run</code> on it from the CMD command of the Dockerfile?</p>
  
  <p>Running <code>sbt run</code> has to be from within the /myapp directory. How do I tell the CMD command that <code>sbt run</code> should be run from that directory?</p>