Moved local dir to /opt/sys_config

Improved error logging and added function handling calls with log and return values
Improved check for matching sudo rule

client_software/0030_desktop/install.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env sh
+# SPDX-FileCopyrightText: Daniel Pätzold
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+# Sofwareinstallation script for Nextcloud Talk.
+#
+
+#Check for root
+if [ "$EUID" -ne 0 ]; then
+    echo "Error: Script requires root. Please check if ${SCRIPTPATH}/${SCRIPTNAME} is in sudoers rules and if you are a member. And if executed via sudo."
+    exit 1
+fi
+
+cp -n *.desktop $SUDO_HOME/Schreibtisch
+chown $SUDO_USER:$SUDO_USER $SUDO_HOME/Schreibtisch/*.desktop