steamdeck precondition

Co-authored-by: Liam <[email protected]>

core/tabs/system-setup/tab_data.toml

@@ -21,6 +21,11 @@ description = "Valve's fork of Linux Kernel for the SteamDeck"
 script = "arch/linux-neptune.sh"
 task_list = "I PFM K"
 
+[[data.preconditions]]
+matches = true
+data = { file = "/sys/devices/virtual/dmi/id/board_vendor" }
+values = [ "Valve", "Jupiter" ]
+
 [[data.entries]]
 name = "Paru AUR Helper"
 description = "Paru is your standard pacman wrapping AUR helper with lots of features and minimal interaction.\nTo know more about AUR helpers visit: https://wiki.archlinux.org/title/AUR_helpers"