Add update information to AppImage

src/resources/linux/appimage/pkg2appimage

@@ -467,5 +467,6 @@ fi
 # Go out of AppImage
 cd ..
 
+export UPDATE_INFORMATION="gh-releases-zsync|VSCodium|vscodium|latest|*.AppImage.zsync"
 generate_type2_appimage
-ls -lh ../out/*.AppImage
+ls -lh ../out/*.AppImage*