feat: Added Torzu's AppImageBuilder

Added support for building AppImages using Torzu's AppImageBuilder.

Signed-off-by: Boss.sfc <boss.sfc@citron-emu.org>

AppImage-build-local.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+FILE=build/bin/citron
+if test -f "$FILE"; then
+    # remove any previously made AppImage in the base citron git folder
+    rm ./citron.AppImage
+
+    # enter AppImage utility folder
+    cd AppImageBuilder
+
+    # run the build script to create the AppImage
+    # (usage) ./build.sh [source citron build folder] [destination .AppImage file]
+    ./build.sh ../build ./citron.AppImage
+
+    FILE=./citron.AppImage
+    if test -f "$FILE"; then
+       # move the AppImage to the main citron folder
+       mv citron.AppImage ..
+       # return to main citron folder
+       cd ..
+       # show contents of current folder
+       echo
+       ls
+       # show AppImages specifically
+       echo
+       ls *.AppImage
+       echo
+       echo "'citron.AppImage' is now located in the current folder."
+       echo
+    else
+       cd ..
+       echo "AppImage was not built."
+    fi
+else
+    echo
+    echo "$FILE does not exist."
+    echo
+    echo "No citron executable found in the /citron/build/bin folder!"
+    echo
+    echo "You must first build a native linux version of citron before running this script!"
+    echo
+fi