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docker/docker-sample/Dockerfile

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+FROM python:3.7-alpine
+WORKDIR /code
+ENV FLASK_APP app.py
+ENV FLASK_RUN_HOST 0.0.0.0
+RUN apk add --no-cache gcc musl-dev linux-headers
+COPY requirements.txt requirements.txt
+RUN pip install -r requirements.txt
+COPY . .
+CMD ["flask", "run"]