build: add Kokoro configs for autorelease

.kokoro/publish.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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 -eo pipefail
+
+export NPM_CONFIG_PREFIX=/home/node/.npm-global
+
+# Start the releasetool reporter
+python3 -m pip install gcp-releasetool
+python3 -m releasetool publish-reporter-script > /tmp/publisher-script; source /tmp/publisher-script
+
+cd $(dirname $0)/..
+
+NPM_TOKEN=$(cat $KOKORO_KEYSTORE_DIR/73713_google_cloud_npm_token)
+echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > ~/.npmrc
+
+npm install
+npm publish --access=public

.kokoro/release/publish.cfg

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+# Get npm token from Keystore
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "google_cloud_npm_token"
+      backend_type: FASTCONFIGPUSH
+    }
+  }
+}
+
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "nodejs-scheduler/.kokoro/trampoline.sh"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/node:8-user"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/nodejs-scheduler/.kokoro/publish.sh"
+}