feat(gnome): Add just command for installing Adwaita-for-Steam, update theme with ublue-update automatically when present

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

@@ -274,6 +274,19 @@ enable-vgui2-theme:
     echo "This is only supported under GNOME."
   fi
 
+# Install Adwaita-for-Steam theme for CSS Loader (https://github.com/tkashkin/Adwaita-for-Steam)
+install-adwaita-for-steam:
+  #!/usr/bin/env bash
+  if [[ ${BASE_IMAGE_NAME} == 'silverblue' ]]; then
+    if [ -d "$HOME/homebrew/themes" ]; then
+      git clone https://github.com/tkashkin/Adwaita-for-Steam.git --single-branch "$HOME/homebrew/themes/Adwaita-for-Steam"
+    else
+      echo 'Please install Decky Loader & CSS Loader first, see just get-decky'
+    fi
+  else 
+    echo "This is only supported under GNOME."
+  fi
+
 # Enable legacy swapfile (Not recommended)
 deckswap-on:
   #!/usr/bin/env bash

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

@@ -246,6 +246,19 @@ enable-vgui2-theme:
     echo "This is only supported under GNOME."
   fi
 
+# Install Adwaita-for-Steam theme for CSS Loader (https://github.com/tkashkin/Adwaita-for-Steam)
+install-adwaita-for-steam:
+  #!/usr/bin/env bash
+  if [[ ${BASE_IMAGE_NAME} == 'silverblue' ]]; then
+    if [ -d "$HOME/homebrew/themes" ]; then
+      git clone https://github.com/tkashkin/Adwaita-for-Steam.git --single-branch "$HOME/homebrew/themes/Adwaita-for-Steam"
+    else
+      echo 'Please install Decky Loader & CSS Loader first'
+    fi
+  else 
+    echo "This is only supported under GNOME."
+  fi
+
 # Set system to boot without showing the grub screen with options
 hide-grub:
   #!/usr/bin/env bash

system_files/desktop/silverblue/usr/etc/ublue-update.d/user/80-adwaita-for-steam-user-update.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/bash
+shopt -s nullglob
+
+if [ -d "$HOME/homebrew/themes/Adwaita-for-Steam" ]; then
+  cd "$HOME/homebrew/themes/Adwaita-for-Steam"
+  git pull
+fi