NIFI-7415: Add .asf.yaml to configure GitHub integrations

Signed-off-by: Pierre Villard <pierre.villard.fr@gmail.com>

This closes #4246.

.asf.yaml

@@ -0,0 +1,34 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+github:
+  description: "Apache NiFi"
+  homepage: https://nifi.apache.org/
+  labels:
+    - nifi
+    - java
+  features:
+    wiki: false
+    issues: false
+    projects: false
+  enabled_merge_buttons:
+    squash:  true
+    merge:   true
+    rebase:  true
+notifications:
+    commits:      commits@nifi.apache.org
+    issues:       issues@nifi.apache.org
+    pullrequests: issues@nifi.apache.org
+    jira_options: link label worklog