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Nevermind, this does the trick

FROM python:3.7.2-stretch

WORKDIR /app

RUN pip install flask uwsgi RUN pip freeze > requirements.txt

CMD export FLASK_APP=index.py && flask run -h 0.0.0.0

Hey Fernando Gonzalez, yeap you're right. It's just randomly disappeared. (Probably because of sanctions or smth)

I pushed it again to the docker hub, but it certainly was an ordinary image that did nothing but to run the flask and what you've written yourself does the job perfectly.