cmd/mstorectl/imagecmd: added os/arch/variant option to repo client

cmd/mstorectl/imagecmd/pullimage.go

@@ -28,6 +28,9 @@ type PullImageParams struct {
 	Imagepath       string
 	Filepath        string
 	UseGoogleClient bool
+	Arch            string
+	OS              string
+	Variant         string
 }
 
 type PullImageResult struct {
@@ -68,7 +71,7 @@ func (util *ImageUtil) pullImage(common *CommonImageParams, params *PullImagePar
 		return res, err
 	}
 	imageDir := auxtool.MakeTmpFilename(params.Filepath)
-	err = load.Pull(ctx, ref.Raw(), imageDir, "", "")
+	err = load.Pull(ctx, ref.Raw(), imageDir, params.OS, params.Arch, params.Variant)
 	if err != nil {
 		return res, err
 	}