Fedora CoreOS: Can I shutdown instead of rebooting, after installing with coreos-installer?

When installing the system with [coreos-installer](https://coreos.github.io/coreos-installer/) utility, **if the image contains an embedded Ignition configuration**, after the installation completes, the system will reboot. **Question**: Is there a way to override this behaviour to shutdown instead of rebooting? For example via kernel arguments or something similar? **Why**: The reason I want this behaviour is that I'm installing Fedora CoreOS via a live ISO on VirtualBox, and I have the Ignition configuration embedded into the ISO. Since the installation starts automatically, I don't have to input commands and shutdown manually. However, once the installation process completes, the system _reboots_, starting the live environment again and re-installing the system in a loop, until I manually stop the VM and "remove" the live ISO media. So I have to intercept when the installation is done, which is a little inconvenient.