Update Dockerfile

Dockerfile

@@ -25,8 +25,8 @@ RUN pip3 install jupyterhub && \
     pip3 install --upgrade jupyterlab jupyterlab-git && \
     pip3 install ipywidgets && \
     pip3 install torch torchvision torchaudio && \
-    pip3 install langchain trulens-eval trulens
-    jupyter lab build
+    pip3 install langchain trulens-eval trulens && \
+    pip3 install jupyter lab build
     
 RUN jupyter nbextension enable --py widgetsnbextension