Update heroku.md (#1807)

Co-authored-by: Rico Sta. Cruz <rstacruz@users.noreply.github.com>

heroku.md

@@ -19,6 +19,18 @@ heroku create sushi
 git push heroku master
 ```
 
+This will create an application named `sushi`. ([docs](https://devcenter.heroku.com/articles/creating-apps))
+
+### `container` - Docker containers
+
+```bash
+heroku stack:set container -app <app>
+heroku container:push web -app <app>
+heroku container:release web -app <app>
+```
+
+Containers can be deployed using the Heroku Container Registry. ([docs](https://devcenter.heroku.com/articles/container-registry-and-runtime))
+
 ### `access` - Collaboration
 
 #### Manage collaborators