Feature: add asf.yaml for Cloudberry under ASF

Following the Apache request to set the apache/cloudberry repo
configurations in the new file .asf.yaml, including notifications, tags,
branch protection policy, merge buttons, and other repo metadata.

.asf.yaml

@@ -0,0 +1,85 @@
+#
+# 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: One of the most advanced and mature open-source MPP (Massively Parallel Processing) databases available. Open source alternative to Greenplum Database.
+  homepage: https://cloudberry.apache.org
+  labels:
+    - mpp
+    - big-data
+    - data-warehouse
+    - data-analysis
+    - olap
+    - distributed-database
+    - database
+    - postgres
+    - postgresql
+    - greenplum
+    - ai
+    - sql
+    - c
+  features:
+    # Enable wiki for documentation
+    wiki: false
+    # Enable issues management
+    issues: true
+    # Enable projects for project management boards
+    projects: true
+  enabled_merge_buttons:
+    # enable squash button:
+    squash: true
+    # disable merge button:
+    merge: false
+    # enable rebase button:
+    rebase: true
+  protected_branches:
+    main:
+      required_status_checks:
+        # strict means "Require branches to be up to date before merging".
+        strict: true
+        # contexts are the names of checks that must pass.
+        contexts:
+          - cbdb pipeline/build
+          - cbdb pipeline/icw-test
+          - cbdb pipeline/ic-singlenode-test
+          - cbdb pipeline/icw-expandshrink-test
+          - cbdb pipeline/icw-resgroup-test
+          - cbdb pipeline/icw-orca-test
+          - cbdb pipeline/icw-parallel-test
+          - cbdb external_fts pipeline/build
+          - cbdb external_fts pipeline/icw-test
+      required_pull_request_reviews:
+        dismiss_stale_reviews: true
+        required_approving_review_count: 2
+      # squash or rebase must be allowed in the repo for this setting to be set to true.
+      required_linear_history: true
+
+      required_signatures: false
+
+      # requires all conversations to be resolved before merging is possible
+      required_conversation_resolution: true
+  del_branch_on_merge: true
+  dependabot_alerts: true
+  dependabot_updates: false
+  protected_tags:
+    - "[0-9]*.*"
+notifications:
+  commits: [email protected]
+  issues: [email protected]
+  pullrequests: [email protected]
+  discussions: [email protected]
+  pullrequests_bot_dependabot: [email protected]