feat: support additional rootfs options besides ext4

[mtanski]

No description provided.

[Adphi]

Hello @mtanski, thanks for the pull request ! 😀

Can you please add an e2e test case for the feature ?

d2vm/e2e/e2e_test.go

Lines 70 to 96 in 897f49a

	tests := []test{
	{
	name: "single-partition",
	},
	{
	name: "split-boot",
	args: []string{"--split-boot"},
	},
	{
	name: "fat32",
	args: []string{"--split-boot", "--boot-fs=fat32"},
	},
	{
	name: "luks",
	args: []string{"--luks-password=root"},
	},
	{
	name: "grub",
	args: []string{"--bootloader=grub"},
	efi: true,
	},
	{
	name: "grub-luks",
	args: []string{"--bootloader=grub", "--luks-password=root"},
	efi: true,
	},
	}