Dockerfile for using google-cloud (or any native module) and sharing app with Mac local

Dockerfile

#alpine-node is a super small distro with just the minimum to run
FROM mhart/alpine-node:6

WORKDIR /app

#allow local code to mount into this directory
VOLUME /app

#move all native plugins up to -g installs and link them one level above the app
RUN npm install -g google-cloud && cd / && npm link google-cloud && cd /app

#serve on port 8080
EXPOSE 8080

#call npm start on whatever directory you mounted to /app
CMD npm start