Add apt-get update hook for chroot package installation

- Created apt-update.hook.chroot to run apt-get update before package installation
- Ensures chroot has current package lists from all configured repositories
- Critical for firmware package installation from Devuan and Debian repos
- Runs automatically during live-build process before packages are installed
- Prevents package installation failures due to outdated package lists

config/hooks/live/apt-update.hook.chroot

+#!/bin/bash
+# Update package lists before installing packages
+# This ensures the chroot has current package information from all repositories
+
+echo "Updating package lists in chroot..."
+apt-get update
+
+echo "Package lists updated successfully"
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