add XDG_CACHE_HOME to system enva

recipes-core/base-files/base-files_%.bbappend

@@ -5,6 +5,7 @@ do_install:append () {
 export GDK_BACKEND=wayland
 export XDG_RUNTIME_DIR=/home/$USER/.xdg
 export XDG_CONFIG_HOME=/home/$USER/.config
+export XDG_CACHE_HOME=/home/$USER/.cache
 export PATH=$PATH:/home/$USER/bin:/home/$USER/.local/bin
 export LD_LIBRARY_PATH=/home/$USER/lib:/home/$USER/.local/lib
 export DBUS_SYSTEM_BUS_ADDRESS=unix:path=/run/dbus/system_bus_socket