distro/rhel85: add image and qcow pipelines

Live image pipeline: Creates the live image in a file through a loopback
device.

Stages:
- truncate: create the file to hold the image
- sfdisk: partition the device
- mkfs.fat, mkfs.xfs: create the filesystems
- copy: copy the tree from the previous pipeline (the OS pipeline) into
  the directories where the partitions are mounted
- grub2.inst: install the bootloader

QEMU pipeline: Convert the live image from the previous pipeline to a
qcow2 image.

internal/osbuild2/qemu_stage_test.go

@@ -0,0 +1,48 @@
+package osbuild2
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewQemukStage(t *testing.T) {
+
+	formatOptionsList := []QEMUFormatOptions{
+		Qcow2Options{
+			Type:   "qcow2",
+			Compat: "0.10",
+		},
+		VPCOptions{
+			Type: "vpc",
+		},
+		VMDKOptions{
+			Type: "vmdk",
+		},
+	}
+
+	input := new(QEMUStageInput)
+	input.Type = "org.osbuild.files"
+	input.Origin = "org.osbuild.pipeline"
+	input.References = map[string]QEMUFile{
+		"name:stage": {
+			File: "img.raw",
+		},
+	}
+	inputs := QEMUStageInputs{Image: input}
+
+	for _, format := range formatOptionsList {
+		options := QEMUStageOptions{
+			Filename: "img.out",
+			Format:   format,
+		}
+		expectedStage := &Stage{
+			Type:    "org.osbuild.qemu",
+			Options: &options,
+			Inputs:  &inputs,
+		}
+
+		actualStage := NewQEMUStage(&options, &inputs)
+		assert.Equal(t, expectedStage, actualStage)
+	}
+}

internal/osbuild2/sfdisk_stage_test.go

@@ -0,0 +1,37 @@
+package osbuild2
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewSfdiskStage(t *testing.T) {
+
+	partition := Partition{
+		Bootable: true,
+		Name:     "root",
+		Size:     2097152,
+		Start:    0,
+		Type:     "C12A7328-F81F-11D2-BA4B-00A0C93EC93B",
+		UUID:     "68B2905B-DF3E-4FB3-80FA-49D1E773AA33",
+	}
+
+	options := SfdiskStageOptions{
+		Label:      "gpt",
+		UUID:       "D209C89E-EA5E-4FBD-B161-B461CCE297E0",
+		Partitions: []Partition{partition},
+	}
+
+	device := NewLoopbackDevice(&LoopbackDeviceOptions{Filename: "disk.raw"})
+	devices := SfdiskStageDevices{*device}
+
+	expectedStage := &Stage{
+		Type:    "org.osbuild.sfdisk",
+		Options: &options,
+		Devices: &devices,
+	}
+
+	actualStage := NewSfdiskStage(&options, &devices)
+	assert.Equal(t, expectedStage, actualStage)
+}