Optimized Dockerfile for Python app

Dockerfile

FROM alpine:3.5

WORKDIR /app

COPY requirements.txt /app/requirements.txt
RUN apk add --no-cache nodejs python3 libstdc++ python3-dev libxml2-dev libxslt-dev linux-headers && \
      npm install -g pm2 && \
      apk add --no-cache \
        --virtual=.build-dependencies \
        g++ gfortran musl-dev git && \
      ln -s locale.h /usr/include/xlocale.h && \
      ln -s /usr/include/libxml2/libxml/xmlversion.h /usr/include/xmlversion.h && \
      mkdir /usr/include/libxml && \
      ln -s /usr/include/libxml2/libxml/xmlversion.h /usr/include/libxml/xmlversion.h && \
      ln -s /usr/include/libxml2/libxml/xmlexports.h /usr/include/xmlexports.h && \
      ln -s /usr/include/libxml2/libxml/xmlexports.h /usr/include/libxml/xmlexports.h && \
      pip3 install -r requirements.txt && \
      pm2 install pm2-logrotate && \
      pm2 set pm2-logrotate:max_size 10M && \
      pm2 set pm2-logrotate:compress true && \
      pm2 set pm2-logrotate:retain 7 && \
      pm2 set pm2-logrotate:rotateInterval '0 0 * * *' && \
      pm2 restart pm2-logrotate && \
      rm /usr/include/xlocale.h && \
      rm -r /root/.cache && \
      apk del .build-dependencies

COPY . /app

ENV DJANGO_ENV=production