make run_archiso forward VM's port 22 to host 60022, for easy SSH testing

scripts/run_archiso.sh

@@ -98,7 +98,7 @@ run_image() {
         -audiodev pa,id=snd0 \
         -device ich9-intel-hda \
         -device hda-output,audiodev=snd0 \
-        -device virtio-net-pci,romfile=,netdev=net0 -netdev user,id=net0 \
+        -device virtio-net-pci,romfile=,netdev=net0 -netdev user,id=net0,hostfwd=tcp::60022-:22 \
         -machine type=q35,smm=on,accel=kvm,usb=on,pcspk-audiodev=snd0 \
         -global ICH9-LPC.disable_s3=1 \
         -enable-kvm \