Implement automatic page scaling feature with viewport adjustments

chromium-setup/emmc-provisioning/scripts/install-usbboot-on-host.sh

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+#!/usr/bin/env bash
+# Run on the Proxmox HOST (root) when the host has internet.
+# Builds usbboot (rpiboot) and installs to /opt/usbboot so the auto-flash can run.
+
+set -e
+apt-get update
+apt-get install -y libusb-1.0-0-dev git
+cd /tmp
+rm -rf usbboot
+git clone --depth=1 https://github.com/raspberrypi/usbboot
+cd usbboot
+make
+mkdir -p /opt/usbboot
+cp rpiboot /opt/usbboot/
+echo "usbboot installed at /opt/usbboot/rpiboot"