pipeline: add rawfs assembler support

Signed-off-by: Tom Gundersen <teg@jklm.no>

internal/pipeline/rawfs_assembler.go

@@ -0,0 +1,21 @@
+package pipeline
+
+import "github.com/google/uuid"
+
+// RawFSAssemblerOptions desrcibe how to assemble a tree into a raw filesystem
+// image.
+type RawFSAssemblerOptions struct {
+	Filename           string    `json:"filename"`
+	RootFilesystemUUDI uuid.UUID `json:"root_fs_uuid"`
+	Size               uint64    `json:"size"`
+}
+
+func (RawFSAssemblerOptions) isAssemblerOptions() {}
+
+// NewRawFSAssembler creates a new RawFS Assembler object.
+func NewRawFSAssembler(options *RawFSAssemblerOptions) *Assembler {
+	return &Assembler{
+		Name:    "org.osbuild.rawfs",
+		Options: options,
+	}
+}