L2SS-989: Allow propagation of signals through bash

bin/start-ds.sh

@@ -46,4 +46,6 @@ fi
 # docker-compose files.
 cd "$CWD" || exit 1
 
-/usr/local/bin/wait-for-it.sh "$TANGO_HOST" --timeout=30 --strict -- "$@"
+# Replace this script's process with the actual command, allowing any signals
+# send to the bash PID to be sent to the command directly.
+exec /usr/local/bin/wait-for-it.sh "$TANGO_HOST" --timeout=30 --strict -- "$@"