Add script to automate tag creation.

hack/tag_release.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Copyright 2018 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.
+
+set -eux -o pipefail
+
+if [ "$#" -ne 1 ]; then
+  echo "Usage: tag_release.sh <major>.<minor>.<build>" >&2
+  exit 1
+fi
+
+readonly version=$1
+readonly tag="v${version}"
+if [[ ! "${version}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+  echo "supplied version does not match expectations: ${version}"
+  exit 2
+fi
+
+readonly clean_repo=$(mktemp -d)
+git clone --depth 1 git@github.com:kubernetes/minikube.git "${clean_repo}"
+cd "${clean_repo}"
+git fetch
+git checkout master
+git pull
+git tag -a "${tag}" -m "$version Release"
+git push origin "${tag}"
+