install bsdmainutils for column command

Dockerfile

@@ -10,12 +10,12 @@ FROM ${RENKU_BASE_IMAGE}
 # e.g. the following installs apt-utils and vim; each pkg on its own line, all lines
 # except for the last end with backslash '\' to continue the RUN line
 #
-# USER root
-# RUN apt-get update && \
-#    apt-get install -y --no-install-recommends \
-#    apt-utils \
-#    vim
-# USER ${NB_USER}
+USER root
+RUN apt-get update && \
+   apt-get install -y --no-install-recommends \
+   apt-utils \
+   bsdmainutils
+USER ${NB_USER}
 
 # install the R dependencies
 COPY install.R /tmp/
@@ -38,4 +38,4 @@ RUN if [ -n "$RENKU_VERSION" ] ; then \
     pipx install --force renku==${RENKU_VERSION} \
     ; fi
 
-########################################################
\ No newline at end of file
+########################################################