Dockerfile

# use our bootstrap image
FROM bootstrap_demo

# /app already exists. no need to create it
WORKDIR /app

# add the precompiled node_modules to our workdir
RUN ln -sf /tmp/node_modules .

# Add the newest package.json. Perhaps it's different from base-package.json. Perhaps not
ADD ./package.json .

# install dependencies based on the newest file.
# if package.json == base-package.json then this will success
# very quickly instead of rebuilding everything
RUN npm install