Deploying to heroku is relatively easy following these steps.
First, make sure you have the heroku CLI installed and log into it as well as loging into Heroku's container registry.
$ heroku login
$ heroku container:login
You might also need to set your Heroku app's stack to container
$ heroku stack:set container -a <your-app>
We can now build/push the Docker image to Heroku's container registry and release it to the web
worker.
$ heroku container:push web -a <your-app>
$ heroku container:release web -a <your-app>
With that, you should have Backstage up and running!