Python buildpack attempt within Dockerifle

Dockerfile

FROM heroku/cedar:14

RUN useradd -d /app -m app
USER app
WORKDIR /app/src

ENV HOME /app
ENV PORT 3000
ENV PATH /app/.heroku/python/bin:/tmp/python-pack/bin:$PATH
ENV STACK cedar-14
ENV PYTHONHOME /app/.heroku/python
ENV PYTHONPATH /app/


RUN mkdir -p /app/.heroku
RUN mkdir -p /tmp/app
RUN mkdir -p /app/src
RUN mkdir -p /app/.profile.d
RUN mkdir -p /tmp/python-pack
RUN mkdir -p /tmp/cache
RUN mkdir -p /tmp/environment


WORKDIR /app/src
WORKDIR /tmp/python-buildpack/bin

WORKDIR /app/
ONBUILD COPY . /app/

ONBUILD RUN git clone https://github.com/heroku/heroku-buildpack-python.git /tmp/python-pack -b docker
ONBUILD RUN bash -l /tmp/python-pack/bin/compile /app /tmp/cache /app/.env

ONBUILD COPY . /app/src/
ONBUILD EXPOSE 3000