Initial docker file parts for a python3 app

Dockerfile

FROM debian:jessie

RUN apt-get update && apt-get install -y \
    python3 python3-dev \
    python3-pip \
    python3-virtualenv

RUN python3 -m virtualenv --python=python3 /ve
ENV PATH=/ve/bin:${PATH}

COPY requirements.txt /requirements.txt
RUN pip install --upgrade setuptools==20.0 pip==8.0.2
RUN pip install -r /requirements.txt

CMD ["/bin/bash"]