Use python alpine to reduce image size

[p0lygun]

The current image size is 653MB using alpine we can make it smaller,

Resources

https://medium.com/c0d1um/building-django-docker-image-with-alpine-32de65d2706

[p0lygun]

a docker file for installing poetry https://github.com/FrederikP/python-poetry-alpine/blob/master/Dockerfile

[p0lygun]

pg_config needs to be installed in alpine linux

possible fix via using

RUN apk update \
    && apk add libpq postgresql-dev \
    && apk add build-base

[p0lygun]

closing as alpine is too unstable in production and the gain is not that great