anchor.diff:  RUN pip install -q wheels/*.whl
   RUN adduser -D app && chown -R app:app /app
   USER app
  -ARG FLASK_APP
  -ARG FLASK_ENV
   ENV FLASK_ENV=${FLASK_ENV:-development}
   ENV FLASK_APP=${FLASK_APP:-changeme}
  -EXPOSE 5000
   CMD exec flask run -h ::
  
positive.code: 
  COPY . /app
  WORKDIR /app
  # Improvement: don't bake the wheels directory into the image
  RUN [ -d wheels ] || pip wheel -qw wheels -r requirements.txt && rm -f pip-selfcheck.json
  
  #----------------------------------------------------------------------------
  FROM python:3-alpine
  LABEL maintainer="Alexandre Hamelin <alexandre.hamelin gmail.com>" \
        copyright="Copyright (c) 2019, Alexandre Hamelin <alexandre.hamelin gmail.com>" \
        license="MIT"
  # Update pip in the container and grab the app from the builder container.
  # No need for virtualenv, which will cause otherwise some problems when the app
  # is mounted from the host for development (permissions, especially if running
  
negative.code: # The application Dockerfile
  #
  # Copyright (c) 2020, Alexandre Hamelin <alexandre.hamelin gmail.com>
  #
  FROM python:3-alpine AS builder
  LABEL maintainer="Alexandre Hamelin <alexandre.hamelin gmail.com>" \
        copyright="Copyright (c) 2020, Alexandre Hamelin <alexandre.hamelin gmail.com>" \
        license="MIT"
  
  # Update pip and build the requirements as wheel files.
  