chore: signal reviewer of migrations happening

Whane a new PR that touches migrations is made, an action is triggered to signal
the reviewer: PRs that handle migrations should be merged carefully, as they
need to run accordingly to the state of the repo.

Signed-off-by: Luca Zaninotto <luca.zaninotto@secomind.com>

Author: lusergit

.github/workflows/migrations-check.yaml

@@ -0,0 +1,40 @@
+#
+# This file is part of Edgehog.
+#
+# Copyright 2025 SECO Mind Srl
+#
+# 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+name: Migrations check
+
+on:
+  # Run on pull requests matching apps
+  pull_request:
+    paths:
+      - "backend/priv/repo/migrations/**"
+      - "backend/priv/resource_snapshots/**"
+      - ".github/workflows/migrations-check.yaml"
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    permissions: write-all
+    steps:
+      - uses: mshick/add-pr-comment@v2
+        with:
+          message: |
+            **⚠️ This PR chenges migrations and/or snapshots**
+            Ensure that it is are based on the latest changes in the base branch before merging.