Add CachyOS keyrings and AUR packages

airootfs/root/customize_airootfs.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# Populate the keyring in the built root from the keyring bundles
+# (/usr/share/pacman/keyrings, incl. the copied cachyos keyring).
+# This mirrors the guide; it runs inside the image you are making.
+# pacman-key --populate needs no network.
+pacman-key --init
+pacman-key --populate archlinux cachyos chaotic
+
+# Restore the strict live /etc/pacman.conf after pacstrap installs the
+# 'pacman' package, which ships a stock /etc/pacman.conf and would otherwise
+# overwrite this directory's configured version.
+install -m 0644 /root/.live-pacman.conf /etc/pacman.conf
+rm -f /root/.live-pacman.conf