Enhancement: Add ability to build efi VM

[EYEVO]

I've noticed that the vm's made are of the bios type.
To leverage all the benefits from uefi it would be ideal to be able to make vm's of the efi type.

What I have found if you add to the windows.pkr.hcl it boots just fine:

boot_wait             = "1s"
boot_command          = ["a<enter><wait>a<enter><wait>a<enter><wait>a<enter>"]

However, then when it starts installing, it starts to complain about the unattend file having the wrong partitions. So adding the proper unattended allows you to install in efi mode.

Would be a nice addition to this repo.
Let me know if you need me to test anything.

[andif888]

indeed, efi or efi-secure requires a different disk layout.
In the autounattend.xml you need to change the DiskConfiguration

           <DiskConfiguration>
                <Disk wcm:action="add">
                    <CreatePartitions>
                        <CreatePartition wcm:action="add">
                            <Size>400</Size>
                            <Order>1</Order>
                            <Type>EFI</Type>
                        </CreatePartition>
                        <CreatePartition wcm:action="add">
                            <Size>128</Size>
                            <Order>2</Order>
                            <Type>MSR</Type>
                        </CreatePartition>
                        <CreatePartition wcm:action="add">
                            <Order>3</Order>
                            <Extend>true</Extend>
                            <Type>Primary</Type>
                        </CreatePartition>
                    </CreatePartitions>
                    <DiskID>0</DiskID>
                    <WillWipeDisk>true</WillWipeDisk>
                </Disk>
            </DiskConfiguration>

[andif888]

and obviously the InstallTo to:

                    <InstallTo>
                        <DiskID>0</DiskID>
                        <PartitionID>3</PartitionID>
                    </InstallTo>