boot_iso {
      type = "scsi"
      iso_file = "local:iso/debian-12.9.0-amd64-netinst.iso"
      unmount = true
      iso_checksum = "sha512:9ebe405c3404a005ce926e483bc6c6841b405c4d85e0c8a7b1707a7fe4957c617ae44bd807a57ec3e5c2d3e99f2101dfb26ef36b3720896906bdc3aaeec4cd80"
    }