Add support to --chown flag to ADD command

integration/dockerfiles-with-context/issue-57/Dockerfile

@@ -0,0 +1,27 @@
+# Copyright 2020 Google, Inc. All rights reserved.
+#
+# 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.
+
+FROM busybox
+
+RUN addgroup -g 1001 -S appgroup \
+  && adduser -u 1005 -S al -G appgroup \
+  && adduser -u 1004 -S bob -G appgroup
+
+# Add local file with and without chown
+ADD --chown=1005:appgroup a.txt /a.txt
+ADD b.txt /b.txt
+
+# Add remote file with and without chown
+ADD --chown=bob:1001 https://raw.githubusercontent.com/GoogleContainerTools/kaniko/master/README.md /r1.txt
+ADD https://raw.githubusercontent.com/GoogleContainerTools/kaniko/master/README.md /r2.txt