Add debugging in build.sh for running sites problem (#876)

build.sh

@@ -22,6 +22,10 @@ echo "Warning: deleting all docker containers and deleting ~/.ddev/Test*"
 if [ "$(docker ps -aq | wc -l)" -gt 0 ] ; then
 	docker rm -f $(docker ps -aq)
 fi
+ddev list
+echo "Docker ps -a:"
+docker ps -a
+
 # Update all images that may have changed
 docker images |grep -v REPOSITORY | awk '{print $1":"$2 }' | xargs -L1 docker pull
 rm -rf ~/.ddev/Test*