Doesn't seem like the interactive cli nor the cli proper provide the ability to specify which version of an OS to use. We are stuck with whatever is listed as the default (ex. https://github.com/fossable/goldboot/blob/master/goldboot/src/foundry/molds/arch_linux/mod.rs#L47-L54). This causes issues when the default is no longer available like in the case of that ArchLinux iso.