add changelog checker

Author: Roman

.github/workflows/changelog-checker.yml

@@ -0,0 +1,21 @@
+name: Changelog guard (for release of hotfix)
+on:
+  pull_request:
+    branches:
+      - 'release/**'
+      - 'Release/**'
+      - 'hotfix/**'
+      - 'Hotfix/**'
+
+jobs:
+  changelog:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: tj-actions/changed-files@v42
+        id: changed
+      - name: Ensure CHANGELOG.md updated
+        if: contains(steps.changed.outputs.all_changed_files, 'CHANGELOG.md') == false
+        uses: actions/github-script@v7
+        with:
+          script: core.setFailed('CHANGELOG.md must be updated.')