root test

Dockerfile

@@ -14,6 +14,7 @@ RUN apt-get update --yes && \
     ca-certificates \
     locales \
     curl \
+    dnsutils \
     sudo \
     nano \
     build-essential \
@@ -166,4 +167,5 @@ HEALTHCHECK  --interval=5s --timeout=3s --start-period=5s --retries=3 \
 # Switch back to jovyan to avoid accidental container runs as root
 USER ${NB_UID}
 RUN jupyter labextension disable "@jupyterlab/apputils-extension:announcements"
+USER ROOT
 WORKDIR "${HOME}"