anchor.diff:  # SCALE_DB_NAME
   # SCALE_DB_USER
   # SCALE_DB_PASS
  +# SCALE_UI_URL
   # SCALE_LOGGING_ADDRESS
   # MESOS_MASTER_URL
   # SCALE_ZK_URL
  
positive.code: COPY scale/pip/docs.txt /tmp/
  RUN  pip install -r /tmp/docs.txt \
   && mkdir -p /opt/scale/ui \
   && curl -L https://s3.amazonaws.com/ais-public-artifacts/scale-ui/scale-ui.tar.gz | tar -C /opt/scale/ui -zx \
   && make -C /opt/scale/docs code_docs html \
   # cleanup unneeded pip packages and cache
   && pip uninstall -y -r /tmp/docs.txt \
  
negative.code: # release build. Otherwise it is typically a build number or git hash.
  # if present, the qualifier will be '.${BUILDNUM}
  ARG BUILDNUM=''
  
  # Default location for the Scale UI to be retrieved from.
  # This should be changed on disconnected networks to point to the directory with the tarballs.
  ENV SCALE_UI_URL https://s3.amazonaws.com/ais-public-artifacts/scale-ui
  
  # setup the scale user and sudo so mounts, etc. work properly
  RUN useradd --uid 7498 -M -d /opt/scale scale
  