Run chmod as root

Dockerfile

@@ -9,6 +9,9 @@ RUN pipx install renku=='0.9.1' --force
 # except for the last end with backslash '\' to continue the RUN line
 #
 USER root
+
+RUN chmod -R 777 /usr/local/lib/R/site-library
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
      apt-utils \
@@ -35,5 +38,3 @@ RUN R -f /tmp/install.R
 # install the python dependencies
 COPY requirements.txt /tmp/
 RUN pip3 install -r /tmp/requirements.txt
-
-RUN chmod -R 777 /usr/local/lib/R/site-library
\ No newline at end of file