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Avoid doing an `npm install` after an `ADD .` command
FROM ubuntu
RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get update
RUN apt-get -y install python-software-properties git build-essential
RUN add-apt-repository -y ppa:chris-lea/node.js
RUN apt-get update
RUN apt-get -y install nodejs
WORKDIR /opt/app
ADD . /opt/app
RUN npm install
EXPOSE 3001
CMD ["node", "server.js"]
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