anchor.diff:      apt-get clean && \
       rm -rf /var/lib/apt/lists/*
   
  -# 1.3.959 is latest version that works with jupyter-rsession-proxy
  -# See https://github.com/jupyterhub/jupyter-rsession-proxy/issues/93#issuecomment-725874693
  -ENV RSTUDIO_URL https://download2.rstudio.org/server/bionic/amd64/rstudio-server-1.3.959-amd64.deb
  -RUN curl --silent --location --fail ${RSTUDIO_URL} > /tmp/rstudio.deb && \
  -    dpkg -i /tmp/rstudio.deb && \
  -    rm /tmp/rstudio.deb
  -
   COPY install-mambaforge.bash /tmp/install-mambaforge.bash
   RUN /tmp/install-mambaforge.bash
   
  
positive.code: 
  COPY requirements.txt /tmp/requirements.txt
  RUN pip install --no-cache-dir -r /tmp/requirements.txt
  
  # Install IRKernel
  RUN R --quiet -e "install.packages('IRkernel', quiet = TRUE)" && \
  
negative.code: FROM rocker/geospatial:4.1.2
  
  ENV NB_USER rstudio
  ENV NB_UID 1000
  