chore: CI sh/py script changes

Co-authored-by: GreemDev <greemdev@ryujinx.app>

distribution/linux/appimage/build-appimage.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+set -eu
+
+ROOTDIR="$(readlink -f "$(dirname "$0")")"/../../../
+cd "$ROOTDIR"
+
+BUILDDIR=${BUILDDIR:-publish}
+OUTDIR=${OUTDIR:-publish_appimage}
+
+rm -rf AppDir
+mkdir -p AppDir/usr/bin
+
+cp distribution/linux/Ryujinx.desktop AppDir/Ryujinx.desktop
+cp distribution/linux/appimage/AppRun AppDir/AppRun
+cp src/Ryujinx.UI.Common/Resources/Logo_Ryujinx.png AppDir/Ryujinx.svg
+
+
+cp -r "$BUILDDIR"/* AppDir/usr/bin/
+
+# Ensure necessary bins are set as executable
+chmod +x AppDir/AppRun AppDir/usr/bin/Ryujinx*
+
+mkdir -p "$OUTDIR"
+
+appimagetool -n --comp zstd --mksquashfs-opt -Xcompression-level --mksquashfs-opt 21 \
+    AppDir "$OUTDIR"/Ryujinx.AppImage