Modify base image to use Alpine Linux
# ------------------------------------------------------------------------
# TODO check if it works with a newer version of Debian
-FROM python:3.6.5-alpine as build
+FROM alpine:edge as build
WORKDIR /root
-RUN apk --update --no-cache add rsync pkgconf build-base autoconf automake protobuf libtool libffi-dev python3-dev zeromq-dev openssl-dev
+RUN apk --update --no-cache add rsync pkgconf build-base autoconf automake python3 protobuf libtool libffi-dev python3-dev zeromq-dev openssl-dev
RUN mkdir /install
ENV PYTHONUSERBASE=/install
COPY ./requirements.txt .
