Add Protonup installer

overlay/opt/scripts/install_protonup.sh

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+#!/usr/bin/env bash
+###
+# File: install_lutris.sh
+# Project: scripts
+# File Created: Thursday, 1st January 1970 12:45:00 pm
+# Author: Console and webGui login account (jsunnex@gmail.com)
+# -----
+# Last Modified: Sunday, 16th January 2022 2:17:35 am
+# Modified By: Console and webGui login account (jsunnex@gmail.com)
+###
+
+pkg=protonup
+script_path=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd );
+script_name=$( basename "${BASH_SOURCE[0]}" )
+
+
+install() {
+    if ! command -v ${pkg} >/dev/null; then
+        # Install application
+        python3 -m pip install ${pkg}
+        # Set installation path as user
+        # Note: Run command with su because init processes are run as root but this is a user thing...
+        su ${USER} -c "${pkg} -d '/home/${USER}/.steam/root/compatibilitytools.d/'"
+        # Update to the latest version on startup using the users Downloads directory
+        su ${USER} -c "${pkg} -y -o '/home/${USER}/Downloads/'" &
+    fi
+    # Make sure the desktop icon is removed
+    rm -f /usr/share/applications/protonup.desktop
+}
+
+
+#INSTALLER:
+source "${script_path}/installer.sh"

overlay/usr/share/applications/protonup.desktop

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+[Desktop Entry]
+Name=Installer - Protonup
+Categories=Game;
+Exec=/opt/scripts/install_protonup.sh %U
+Icon=installsoftware
+Terminal=true
+Type=Application