L2SS-499: Prevent silent cd in start-ds

bin/start-ds.sh

@@ -40,6 +40,6 @@ fi
 
 # Return to the stored the directory, this preserves the working_dir argument in
 # docker-compose files.
-cd "$CWD"
+cd "$CWD" || exit 1
 
 /usr/local/bin/wait-for-it.sh "$TANGO_HOST" --timeout=30 --strict -- "$@"