🌱 Always create UEFI partition

[guettli]

What this PR does / why we need it:

This PR changes provisioning bare-metal machines. From now on we always create an UEFI boot partition.

This wastes 514MByte for systems without UEFI, but we think that should not matter much.

This should fix #1118

Boot order is important

If the machine does not enter the rescue system, then the UEFI boot order of the machine might be wrong.

If booting from disk is before network-boot, then the rescue system can't be reached.

See output of efibootmgr.

To change the boot-order, you need to contact the support of Hetzner.

Manual changes to the boot order via efibootmgr -o ... seem to be overwritten automatically by the infrastructure provider.

TODO

• Test with a machine with legacy BIOS (demo account: the one from germany: FSN1-DC8)
• Test with a machine with UEFI (demo account: AX41)

on the ax41 (after the node is running). Check for uefi support:

root@... ~ # efibootmgr 

If you see that, then uefi is NOT running:

EFI variables are not supported on this system.