Add image transformer

pkg/image/append.go

@@ -0,0 +1,33 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package image
+
+// Append appends a slice of type Tag to slice of type Image
+func Append(images []Image, tags ...Tag) []Image {
+	for _, tag := range tags {
+		images = append(images, toImage(tag))
+	}
+	return images
+}
+
+func toImage(tag Tag) Image {
+	return Image{
+		Name:   tag.Name,
+		NewTag: tag.NewTag,
+		Digest: tag.Digest,
+	}
+}