build: add auto-approve (#116)

Author: sofisl

.github/CODEOWNERS

@@ -7,3 +7,4 @@
 
 # The yoshi-nodejs team is the default owner for nodejs repositories.
 *     @googleapis/yoshi-nodejs
+.github/auto-approve.yml @googleapis/github-automation

.github/auto-approve.yml

@@ -0,0 +1,16 @@
+rules:
+- author: "release-please[bot]"
+
+# Title for PRs from yoshi-code-bot MUST start with `chore: release`.
+  title: "^chore: release"
+
+# (Optional) The only changed file paths in an incoming PR MUST end with `package.json` or 
+# `CHANGELOG.md`. These are listed in regex. If this property 
+# is omitted, auto-approve bot will allow PRs that match the author and title to merge, without
+# checking the file paths. 
+  changedFiles:
+  - "package\\.json$"
+  - "CHANGELOG\\.md$"
+
+# (Optional) The max amount of files changed in a PR. 
+  maxFiles: 3

owlbot.py

@@ -0,0 +1,17 @@
+# Copyright 2020 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
+#
+#     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 script is used to synthesize generated parts of this library."""
+import synthtool.languages.node as node
+
+node.owlbot_main(templates_excludes=['.github/CODEOWNERS'])