[Feature]: Expose primary disk ID through API and provider

[Lillecarl]

What whould you like to see?

When infecting hosts with nixos-anywhere the block device order is all fuzzed. I figured out that the naming scheme for volumes is

scsi-0HC_Volume_101788715
scsi-0HC_Volume_$VOLUMEID

and the naming scheme for locally attached disks is

scsi-0QEMU_QEMU_HARDDISK_55932380
scsi-0QEMU_QEMU_HARDDISK_$NOT_SERVERID

When partitioning disks with "disko" (another nix tool) that builds your partition table we can't grep and guess on scsi-0QEMU_QEMU_HARDDISK_.+ sadly, we must provide the full device name.

It would be nice if block device id's are available through the API somehow so we can build an inventory ahead of time! 😄

[lillecarl@hetzner2:~]$ ls -lah /dev/disk/by-id/
total 0
drwxr-xr-x 2 root root 220 Dec 15 18:48 .
drwxr-xr-x 8 root root 160 Dec 15 18:48 ..
lrwxrwxrwx 1 root root   9 Dec 15 18:48 scsi-0HC_Volume_101788715 -> ../../sda
lrwxrwxrwx 1 root root   9 Dec 15 18:48 scsi-0QEMU_QEMU_HARDDISK_55932380 -> ../../sdb

I've compared the ID of my server with the ID of 0QEMU_QEMU_HARDDISK_.+ and it doesn't match.