Unable to deploy the Docker Image of Laravel application on Heroku

I started to learn the Docker. I am a complete beginner to Docker. Now, what I am doing is trying to deploy a Docker image of Laravel application onto the Heroku. I have installed a Laravel project. My Laravel project has only one page, a welcome page showing a message. That’s it. I am just trying to test Docker. I have created a Docker image for my Laravel project and successfully run it on my laptop as follow.