title: Start application during Heroku CI
body: <p>I want to implement integration/e2e tests during Heroku CI phase (which runs for each PR). Tests are connecting to a running server by REST API.</p>
  
  <p>How can I do the DB migration and server startup during CI run (something similar to a review app)? I am using an <a href="https://devcenter.heroku.com/articles/heroku-ci-in-dyno-databases" rel="nofollow noreferrer">in-dyno postgres</a>.</p>