Add pxestick script

scripts/pxestick.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -e
+
+rm -rf build/pxestick
+mkdir -p build/pxestick
+cd build/pxestick
+
+wget -O ipxe.efi http://boot.ipxe.org/ipxe.efi
+dd if=/dev/zero of=usb.img.partial bs=512 count=2048
+mkfs.vfat usb.img.partial
+mmd -i usb.img.partial efi
+mmd -i usb.img.partial efi/boot
+mcopy -i usb.img.partial ipxe.efi ::efi/boot/bootx64.efi
+mv usb.img.partial usb.img