feat: Steam's System settings: the OS name stays CachyOS (no renaming, also not in About this System), Steamify <version> as the variant, the SteamOS release it follows as the codename (steamos-3.9)

patches/steamify-os-release.sh

@@ -1,11 +1,11 @@
 #!/bin/sh
 # Installed by Steamify CachyOS (SteamOS conversion): what Steam shows in its
-# System settings. The OS name is `lsb_release -d` (DISTRIB_DESCRIPTION in
-# /etc/lsb-release); the version comes from /etc/os-release's VARIANT and
-# VERSION_ID. CachyOS's hooks reset lsb-release on updates of lsb-release and
-# cachyos-hooks; the zz-steamify-os-release hook runs this after them.
-# os-release's NAME and PRETTY_NAME stay CachyOS's: limine-snapper-sync finds
-# the boot entries by the OS name.
-sed -i 's|^DISTRIB_DESCRIPTION=.*$|DISTRIB_DESCRIPTION="CachyOS with Steamify"|' /etc/lsb-release
-sed -i -e '/^VARIANT=/d' -e '/^VARIANT_ID=/d' -e '/^VERSION_ID=/d' /etc/os-release
-printf '%s\n' 'VARIANT="Steamify"' 'VARIANT_ID=steamify' 'VERSION_ID=@VERSION@' >> /etc/os-release
+# System settings besides the OS name, which stays CachyOS's: Steamify as the
+# variant and version, and the SteamOS release it follows as the codename
+# (/etc/os-release's VARIANT, VERSION_ID, VERSION_CODENAME). NAME and
+# PRETTY_NAME are never touched: limine-snapper-sync finds the boot entries by
+# the OS name. The zz-steamify-os-release hook runs this after cachyos-hooks.
+sed -i -e '/^VARIANT=/d' -e '/^VARIANT_ID=/d' -e '/^VERSION_ID=/d' -e '/^VERSION_CODENAME=/d' /etc/os-release
+printf '%s\n' 'VARIANT="Steamify @VERSION@"' 'VARIANT_ID=steamify' 'VERSION_ID=@VERSION@' >> /etc/os-release
+[ -n "@CODENAME@" ] && echo 'VERSION_CODENAME=@CODENAME@' >> /etc/os-release
+exit 0