title: Foreman: Use different Procfile in development and production
body: <p>I have a homemade Sinatra application for which I intend to use Heroku to host it.</p>
  
  <p>I use foreman and shotgun in development, with the following Procfile:</p>
  
  <pre><code>web: shotgun config.ru -s thin -o 0.0.0.0 -p $PORT -E $RACK_ENV
  </code></pre>
  
  <p>It works great with both development and production. But the thing is, <strong>I don't want to use shotgun in production</strong> since it's too slow.</p>
  
  <h3>Can we use separate Procfile configurations for both dev and prod?</h3>