How to push Custom Dockfile image to Heroku

The documentation on how to Push and Release Custom Dockerfile (https://devcenter.heroku.com/articles/container-registry-and-runtime) are not updated with latest syntax.

As of Feb 2019, Here are example cli commands to push custom Dockerfile to heroku.

 heroku login
 heroku container:login
 heroku container:push web — app appname-12389
 heroku container:release web — app appname-12389