anchor.diff:  
   # Install bower and gulp
   RUN npm install -g bower
  -RUN npm install -g polymer-cli
  +RUN npm install -g polymer-cli --unsafe-perm
   
   # Copy app
   ENV APP_HOME /myapp
  
positive.code: # gpg keys listed at https://github.com/nodejs/node
  RUN set -ex \
    && for key in \
      9554F04D7259F04124DE6B476D5A82AC7E37093B \
      94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
      0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
      FD3A5288F042B6850C66B31F09FE44734EB7990E \
      71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
      DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
      B9AE9905FFD7803F25714661B63B535A4C206CA9 \
      C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
    ; do \
      gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
    done
  
  ENV NPM_CONFIG_LOGLEVEL info
  ENV NODE_VERSION 6.9.1
  
  # curl
  RUN \
  
negative.code: RUN bower install --production --allow-root
  RUN polymer build
  
  # clean
  RUN npm uninstall -g bower
  RUN npm uninstall -g polymer-cli
  RUN apt-get purge -y curl git gnupg
  
  # prpl-server
  RUN npm install -g prpl-server
  
  EXPOSE 8080
  CMD ["prpl-server","--host", "0.0.0.0", "--root","build","--config","build/polymer.json"]
  