title: Setting up staging environment with Google App Engine
body: <p>I've been able to set up a production environment with the App Engine but now I want to consider setting up a staging environment but this seems harder than I've expected. </p>
  
  <p>To set up the prod env I needed to create an <code>app.yaml</code> file:</p>
  
  <pre><code>env: flex
  runtime: gs://elixir-runtime/elixir.yaml
  runtime_config:
      release_app: statcasters
  beta_settings:
      cloud_sql_instances: statcasters:us-central1:statcastersproduction
  </code></pre>
  
  <p>This makes sense and is super easy but what about a staging env? How do I tell the app engine to deploy a different app? I'm not finding really any good documentation of this anywhere.</p>