Dockerfile with alpine 3.6 python

Dockerfile

FROM alpine:3.6
ENV PYTHONUNBUFFERED 1
WORKDIR /usr/src/national_id
ADD requirements.txt /usr/src/national_id/
RUN apk add --no-cache python3 && \
    python3 -m ensurepip && \
    rm -r /usr/lib/python*/ensurepip && \
    pip3 install --upgrade pip setuptools && \
    if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi && \
    if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi && \
    rm -r /root/.cache
RUN apk update && apk add postgresql-dev gcc python3-dev musl-dev && pip install -r requirements.txt