title: "No command specified for process type web" on Heroku
body: <p>I did <code>heroku container:push web</code> and it gives <code>Your image has been successfully pushed. You can now release it with the 'container:release' command.</code> Then I ran <code>heroku container:release web</code> and it says</p>
  
  <pre><code>No command specified for process type web
  </code></pre>
  
  <p>I also tried <code>heroku stack:set container</code> as suggested <a href="https://stackoverflow.com/questions/55884164/heroku-cli-no-command-specified-for-process-type-web-when-releasing-container">here</a> but no change.</p>
  
  <p>I have Profile as</p>
  
  <pre><code>web: gunicorn app:app --log-file=-
  </code></pre>
  
  <p>Not sure what's wrong and how to debug this. Any help is appreciated!</p>