Generic python dockerfile for multistage builds

Dockerfile

FROM python:3.8-slim as compile-image
RUN apt-get update && apt-get install -y --no-install-recommends build-essential gcc && apt-get clean
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

COPY requirements.txt .
RUN pip install -r requirements.txt
COPY . /app

FROM python:3.8-slim as runtime-image
COPY --from=compile-image /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
COPY . /app
## Replace my-app.py by yours :)
CMD ["/app/my-app.py"]