Add support for boot and driver ISO image

Installing Windows 10 in VirtIO enabled Qemu requires additional drivers. This change makes it possible to exposed those drivers during a Windows 10 install.

quickemu

@@ -148,6 +148,16 @@ function vm_boot() {
     echo "             Existing disk state will be preserved, no writes will be committed."
   fi
 
+  if [ -n "${iso}" ] && [ -e "${iso}" ]; then
+    local ISO_BOOT="-drive media=cdrom,file="${iso}",index=2"
+    echo " - Boot:     ${iso}"
+  fi
+
+  if [ -n "${driver_iso}" ] && [ -e "${driver_iso}" ]; then
+    local ISO_DRIVER="-drive media=cdrom,file="${driver_iso}",index=3"
+    echo " - Drivers:  ${driver_iso}"
+  fi
+
   local cores="1"
   local allcores=$(nproc --all)
   if [ ${allcores} -ge 8 ]; then
@@ -222,8 +232,8 @@ function vm_boot() {
   # Boot the iso image
   ${QEMU} -name ${VMNAME},process=${VMNAME} \
     ${BIOS} \
-    -cdrom "${iso}" \
     -drive id=disk,file=${disk_img},format=qcow2,if=virtio,aio=native,cache.direct=on \
+    ${ISO_BOOT} ${ISO_DRIVER} \
     -enable-kvm \
     -machine q35,accel=kvm \
     -cpu host,kvm=on \