add sudo

Dockerfile

@@ -5,13 +5,15 @@ MAINTAINER BeN
 RUN apt-get clean && apt-get update && apt-get -y upgrade
 
 RUN apt-get install -y \
-    openssh-server
+    openssh-server \
+    vim-tiny sudo
 
 RUN apt-get clean && rm -rf /var/lib/apt/lists/*
 
 RUN useradd -rm -d /home/ben -s /bin/bash -g root -G sudo -u 1000 ben
 
 RUN  echo 'ben:ben' | chpasswd
+RUN echo "ben ALL=NOPASSWD: ALL" > /etc/sudoers.d/ben
 
 RUN service ssh start