Dockerfile

FROM python:3.8
RUN addgroup --system app && adduser --system --group app
WORKDIR /app/
# https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDONTWRITEBYTECODE
# Prevents Python from writing .pyc files to disk
ENV PYTHONDONTWRITEBYTECODE 1

# ensures that the python output is sent straight to terminal (e.g. your container log)
# without being first buffered and that you can see the output of your application (e.g. django logs)
# in real time. Equivalent to python -u: https://docs.python.org/3/using/cmdline.html#cmdoption-u
ENV PYTHONUNBUFFERED 1
ENV ENVIRONMENT prod
ENV TESTING 0

RUN curl -sSL https://install.python-poetry.org | POETRY_HOME=/opt/poetry python && \
    cd /usr/local/bin && \
    ln -s /opt/poetry/bin/poetry && \
    poetry config virtualenvs.create false

# 
COPY ./pyproject.toml ./poetry.lock* /app/

# Allow installing dev dependencies to run tests
ARG INSTALL_DEV=false

RUN bash -c "if [ $INSTALL_DEV == 'true' ] ; then poetry install --no-root ; else poetry install --no-root --no-dev ; fi"

COPY . /app

ENV PYTHONPATH=/app

# chown all the files to the app user
RUN chown -R app:app $HOME
RUN chown -R app /app
RUN chown -R app /usr/local

# change to the app user
# Switch to a non-root user, which is recommended by Heroku.
USER app

# 
#CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
CMD ["bash", "start.sh"]