Build the docker container using
build -t flask-in-docker:latest .
Then deploy the flask app in a container by invoking
docker run -d -p <host>:<port>:5000 flask-in-docker
The host and port variables define the external access ports to the docker container.
If left unspecified, you can identify them for a particular container by
using the docker container list command.
The app will now be running at:
http://<host>:<port>/