anchor.diff:      # R package magick
       libmagick++-dev imagemagick > /dev/null
   
  -ENV RSTUDIO_URL https://download2.rstudio.org/server/bionic/amd64/rstudio-server-2021.09.1-372-amd64.deb
  +ENV RSTUDIO_URL https://download2.rstudio.org/server/bionic/amd64/rstudio-server-2022.07.1-554-amd64.deb
   RUN curl --silent --location --fail ${RSTUDIO_URL} > /tmp/rstudio.deb && \
       dpkg -i /tmp/rstudio.deb && \
       rm /tmp/rstudio.deb
  
positive.code: RUN curl --silent --location --fail ${SHINY_SERVER_URL} > /tmp/shiny-server.deb && \
      dpkg -i /tmp/shiny-server.deb && \
      rm /tmp/shiny-server.deb
  
  # Set CRAN mirror to rspm before we install anything
  COPY Rprofile.site /usr/lib/R/etc/Rprofile.site
  
negative.code: # Install R packages
  # Our pre-built R packages from rspm are built against system libs in focal
  # rstan takes forever to compile from source, and needs libnodejs
  ENV R_VERSION=4.2.1-2.2004.0
  RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
  RUN echo "deb https://cloud.r-project.org/bin/linux/ubuntu focal-cran40/" > /etc/apt/sources.list.d/cran.list
  RUN apt-get update -qq --yes > /dev/null && \
      apt-get install --yes -qq \
      r-base-core=${R_VERSION} \
      r-base-dev=${R_VERSION} \
      r-cran-littler=0.3.15-1.2004.0 > /dev/null
  
  # Needed by RStudio
  RUN apt-get update -qq --yes && \
  