adduser: useradd --no-log-init to reduce lastlog size

If the Docker host does not support sparse files /var/log/lastlog can be extremely large if a large UID is set. --no-log-init prevents lastlog being created.

repo2docker/buildpacks/base.py

@@ -42,10 +42,17 @@ ARG NB_UID
 ENV USER ${NB_USER}
 ENV HOME /home/${NB_USER}
 
-RUN adduser --disabled-password \
-    --gecos "Default user" \
-    --uid ${NB_UID} \
-    ${NB_USER}
+RUN groupadd \
+        --gid ${NB_UID} \
+        ${NB_USER} &&
+    useradd \
+        --comment "Default user" \
+        --create-home \
+        --gid ${NB_UID} \
+        --no-log-init \
+        --shell /bin/bash \
+        --uid ${NB_UID} \
+        ${NB_USER}
 
 RUN wget --quiet -O - https://deb.nodesource.com/gpgkey/nodesource.gpg.key |  apt-key add - && \
     DISTRO="bionic" && \