Install Docker Engine if not yet done. For installation please refer to official Docker - https://docs.docker.com/engine/install/
After cloning the repository run the command to build image and then run the docker container
docker build -t flask-app .
docker images
docker run --name flask_container -p 5000:5000 -it --rm flask-app
docker ps
Once container is running navigate to http://127.0.0.1:5000/ in the browser.