Update Dockerfile

Dockerfile

@@ -13,8 +13,8 @@ RUN useradd -m -s /bin/bash -N -u $NB_UID $NB_USER && \
     # chown $NB_USER $CONDA_DIR -R && \
     # chown $NB_USER /userdata/kerasData -R && \
     #    chown $NB_USER / -R && \
-    mkdir -p / && \
-    chpasswd $NB_USER:test && \
+    # mkdir -p / && \
+    sh -c 'echo "$NB_USER:test" | chpasswd'
     usermod -aG sudo $NB_USER
 
 WORKDIR /userdata/kerasData