style: add copyright and shellcheck ignores

Signed-off-by: Dominik Willner th33xitus@gmail.com

scripts/rollback.sh

@@ -1,3 +1,16 @@
+#!/bin/bash
+
+#=======================================================================#
+# Copyright (C) 2020 - 2022 Dominik Willner <th33xitus@gmail.com>       #
+#                                                                       #
+# This file is part of KIAUH - Klipper Installation And Update Helper   #
+# https://github.com/th33xitus/kiauh                                    #
+#                                                                       #
+# This file may be distributed under the terms of the GNU GPLv3 license #
+#=======================================================================#
+
+set -e
+
 save_klipper_state(){
   source_kiauh_ini
   #read current klipper state