Build failure test

Test to make sure that build fails due to inability to set conda environment variable.

Dockerfile

@@ -27,8 +27,10 @@ RUN chmod u+x ./.docker/setup_config.sh
 
 
 # # This clone puts the server code into the image, not the container
-RUN bash -c "./.docker/setup_config.sh" && echo "finished setup_config.sh"
 
+RUN bash -c "./.docker/setup_config.sh" && echo "finished setup_config.sh" 
+
+RUN if [ -z "$_CE_CONDA" ]; then echo 'Environment variable _CE_CONDA must be specified. Exiting.'; exit 1; fi
 # # #declare environment variables
 # ENV DB_HOST=''
 # ENV WEB_SERVER_HOST=''