Set wallpaper when stumpwm starts

This depends on ‘feh’ being installed and the wallpaper existing. I'll want to
update it to actually depend on the ‘feh’ package and to download the wallpaper
package from somewhere else.

oni/home/services/stumpwm/config

@@ -152,6 +152,8 @@ after it has been unlocked."
 (define-frame-preference "teams"
   (0 t t :class "teams-for-linux" :create t))
 
+(sb-ext:run-program *shell-program* '("-c" "feh --bg-center ~/pictures/wallpaper/5120x1440/wallhaven-v9ydgl.jpg"))
+
 (swank:create-server :dont-close t)
 
 (which-key-mode)