.github: add merge conflict checker per RM request (#6221)

* .github: add merge conflict checker per RM request

Adds a merge conflict checker workflow per current RM (Nicolas's)
request.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

* Update merge-conflict-checker.yml

* Update merge-conflict-checker.yml

Author: yadvr

.github/workflows/merge-conflict-checker.yml

@@ -0,0 +1,39 @@
+# 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.
+
+name: "Check Pull Requests Conflict"
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [synchronize]
+    branches:
+      - main
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check Pull Requests Conflict
+      uses: eps1lon/actions-label-merge-conflict@v2.0.0
+      with:
+        repoToken: "${{ secrets.GITHUB_TOKEN  }}"
+        dirtyLabel: "status:has-conflicts"
+        removeOnDirtyLabel: "status:ready-for-review"
+        continueOnMissingPermissions: true
+        commentOnDirty: "Hi @${author}, your pull request has merge conflicts. Can you fix the conflicts and sync your branch with the base branch?"