Merge pull request #22738 from wojtek-t/build_protobufs_in_docker

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cmd/libs/go2idl/go-to-protobuf/build-image/Dockerfile

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+# Copyright 2016 The Kubernetes Authors 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.
+
+# This file creates a standard build environment for building Kubernetes
+FROM gcr.io/google_containers/kube-cross:KUBE_BUILD_IMAGE_CROSS_TAG
+
+# Mark this as a kube-build container
+RUN touch /kube-build-image
+
+WORKDIR /go/src/k8s.io/kubernetes
+
+# Install goimports tool
+RUN go get golang.org/x/tools/cmd/goimports