Install rpy2 on aarch64 as well (#1871)

Author: mathbunnyru

datascience-notebook/Dockerfile

@@ -80,17 +80,17 @@ RUN mamba install --quiet --yes \
     'r-rsqlite' \
     'r-shiny' \
     'r-tidyverse' \
+    'rpy2' \
     'unixodbc' && \
     mamba clean --all -f -y && \
     fix-permissions "${CONDA_DIR}" && \
     fix-permissions "/home/${NB_USER}"
 
-# `rpy2` and `r-tidymodels` are not easy to install under aarch64
+# `r-tidymodels` is not easy to install under aarch64
 RUN set -x && \
     arch=$(uname -m) && \
     if [ "${arch}" == "x86_64" ]; then \
         mamba install --quiet --yes \
-            'rpy2' \
             'r-tidymodels' && \
             mamba clean --all -f -y && \
             fix-permissions "${CONDA_DIR}" && \