fix: The live session's name is set after the packages (a package overwrote airootfs' os-release)

steamify-customize.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+# steamify-customize.sh <live root>: changes to the live system after its
+# packages are installed (mkarchiso runs it, see modify_mkarchiso in
+# util-iso.sh); files in airootfs are copied before the packages, which
+# overwrite them.
+set -euo pipefail
+root="$1"
+# The name CachyOS Hello shows ("Steamify CachyOS, based on CachyOS rolling").
+sed -i -e 's/^NAME=.*/NAME="Steamify CachyOS, based on CachyOS"/' \
+    -e 's/^PRETTY_NAME=.*/PRETTY_NAME="Steamify CachyOS, based on CachyOS"/' "$root/etc/os-release"