anchor.diff:    UWSGI_BUFFER_SIZE=8096 \
     UWSGI_HARAKIRI=30 \
     UWSGI_SINGLE_INTERPRETER=1 \
  -  UWSGI_PLUGIN=python37 \
  +  UWSGI_PLUGIN=python39 \
     UWSGI_SOCKET=:9999
   
   ENTRYPOINT ["custom-entrypoint"]
  
positive.code: FROM python:3.7
  LABEL maintainer="James Turk <james@openstates.org>"
  
  # global environment settings
  
negative.code:     " \
      && apt-get update && apt-get install -y --no-install-recommends $BUILD_DEPS
  
  RUN cd /usr/lib/uwsgi/plugins && uwsgi --build-plugin "/usr/src/uwsgi/plugins/python python39"
  
  # copy code and entrypoint in
  ADD . /code/
  