I’m trying to deploy the sample app aplinehelloworld to Heroku as a Docker image. This is the recommended way to get started with deploying apps as Docker images to Heroku, as per the following page.

https://devcenter.heroku.com/articles/container-registry-and-runtime#getting-started

I am receiving this error. I’m not a Python expert, so any help you can offer would be much appreciated.

https://peps.python.org/pep-0668/