feat(desktop): Implement Supergfxctl support

system_files/desktop/shared/usr/share/ublue-os/firstboot/yafti.yml

@@ -80,6 +80,13 @@ screens:
           default: true
           packages:
           - Set SteamOS BTRFS mount flags: sudo -A just --unstable set-btrfs-flags
+        Supergfxctl:
+          condition:
+            run: grep "nvidia" <<< $(rpm-ostree status)
+          description: A utility for Nvidia GPU switching
+          default: false
+          packages:
+          - Enable supergfxctl: just --unstable enable-supergfxctl
         System76 Scheduler:
           description: Enables System76 scheduler
           default: true

system_files/desktop/shared/usr/share/ublue-os/just/custom.just

@@ -63,6 +63,18 @@ enable-system76-scheduler:
     gext install s76-scheduler@mattjakeman.com
   fi
 
+enable-supergfxctl:   
+  #!/usr/bin/env bash
+  status=$(rpm-ostree status) 
+  if grep "nvidia" <<< ${status}; then  
+    systemctl enable --now supergfxd.service  
+    if grep "gnome" <<< ${status}; then
+      gext install supergfxctl-gex@asus-linux.org
+    fi 
+  else
+    echo "This requires an Nvidia image."
+  fi
+
 enable-wallpaper-engine:
   #!/usr/bin/env bash
   if grep -v "gnome" <<< $(rpm-ostree status); then