A Heroku install of Ubuntu 20.04 (LTS).
Do an automated deploy to Heroku:
Install Docker.
Build and run the container with Docker.
Install the Heroku CLI.
Create a Heroku app:
heroku create
Note the Heroku app name, and add the Heroku Git repository as a remote to this Git repository:
heroku git:remote -a [heroku-app-name]
Set the app's stack to container:
heroku stack:set container -a [heroku-app-name]
Deploy the app:
git push heroku master
Now open the app in your browser:
heroku open