Update Dockerfile

Dockerfile

-FROM renku/singleuser:latest
+FROM renku/singleuser:0.3.5-renku0.5.2
 
-# Uncomment and adapt if code is to be included in the image
-# COPY src /code/src
+LABEL authors="James Runnalls"
 
-# install the python dependencies
-COPY requirements.txt /tmp/requirements.txt
-USER 0
-RUN pip install -r /tmp/requirements.txt
+USER root
 
-# switch to the user that will be used in the notebook
-USER 1000
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6B05F25D762E3157 \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+    apt-utils \
+    bash-completion \
+    build-essential \
+    curl \
+    virtualenvwrapper \
+    wget \
+    zlib1g-dev \
+    zsh \
+    openssh-server \
+    openssh-client \
+    && apt-get clean
\ No newline at end of file