title: Running multiple jekyll app simultaneously
body: <p>I was wondering if it is possible to run multiple jekyll app at the same time.
  I have installed foreman but it doesn't seem to be able to change the app port when an other one is already running.</p>
  
  <p>At the moment I have to set the jekyll port manually in the Procfile</p>
  
  <pre><code>web: jekyll --server 5000
  </code></pre>
  
  <p>Is it in anyway possible to do this automatically?</p>