Running Flask app locally

Requires Flaks installed. Use Poetry to fulfill dependencies and start a shell inside venv.
Since name of the file containing Flask app is not app.py, first we need to set environment variable FLASK_APP to the name of our app.
export FLASK_APP=hello
After that app can by run using command:
flask run
Page should be accessible at localhost:5000

Running Flask app in Docker container

That's the challenge.
Pay attention to the next caveats:

• Poetry has its own dependecies
• Poetry is needed to resolve dependencies, but venv is not needed in container — its an isolated environment already.
• Host machine is considered to be outside connection by container, so localhost or 127.0.0.1 adress won't work with contanerized flask app
• Make sure you don't need to type entire build and run command every time

Repo restirctions

Commiting to the master can't be disabled in free plan. Please use your own branch for solutions.

Additional info

• Flask Quickstart guide
• Poetry configuration using environment variables
• Makefile tutorial