Update Dockerfile

Dockerfile

@@ -6,6 +6,9 @@ ENV NB_USER keras
 ENV NB_UID 1000
 # RUN mkdir /userdata/kerasData
 
+RUN apt-get update && \
+      apt-get -y install sudo
+
 RUN useradd -m -s /bin/bash -N -u $NB_UID $NB_USER && \
     # chown $NB_USER $CONDA_DIR -R && \
     # chown $NB_USER /userdata/kerasData -R && \
@@ -14,7 +17,8 @@ RUN useradd -m -s /bin/bash -N -u $NB_UID $NB_USER && \
     chpasswd $NB_USER:ar-noc && \
     usermod -aG sudo $NB_USER
 
-RUN  apt-get install sudo -y && \
+RUN adduser docker sudo
+
 USER $NB_USER
 RUN sudo ls 
 WORKDIR /userdata/kerasData