CI: add changelog check workflow for pull requests

Author: dannywillems

.github/workflows/changelog.yaml

@@ -0,0 +1,17 @@
+name: CHANGELOG related checks per pull requests
+on:
+  pull_request:
+    types: [assigned, opened, synchronize, reopened, labeled, unlabeled]
+    branches:
+      - main
+  merge_group:
+    types: [checks_requested]
+
+jobs:
+  check-changelog:
+    name: Check changelog action
+    runs-on: ubuntu-latest
+    steps:
+      - uses: tarides/changelog-check-action@v3
+        with:
+          changelog: CHANGELOG.md