I want to deploy a simple web app to Heroku.
The front-end, back-end, and database of my web app are bundled together with docker-compose.
The Heroku documentation says that typing heroku container:push web should be sufficient to push my app to Heroku, once I have created the appropriate images with docker-compose. This doesn't work for me: the Keroku CLI tells me No images to push.
Adding a -a myAppName tag doesn't help either, nor do other posts on Stack Overflow.
I would prefer not to try this solution, as it would pollute my source control with Heroku-specific configuration.
What can I do to understand what is not working and why?