Update build script

latex/build-image.sh

@@ -15,5 +15,6 @@ if [ -n "$OLD_IMG" ]; then
 	if [ "$OLD_IMG" != "$(docker image ls -q "$1")" ]; then
 		echo "New build uploaded, removing old image, id: $OLD_IMG"
 		docker image rmi -f "$OLD_IMG" || true
+        echo "Exit status: $?"
 	fi
 fi