feat(ci): changelog validation (#724)

Author: gshaibi

.github/workflows/validate-changelog.yaml

@@ -0,0 +1,31 @@
+# Copyright 2025 NVIDIA CORPORATION
+# SPDX-License-Identifier: Apache-2.0
+
+name: Validate Changelog
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+    branches:
+      - main
+      - 'v*.*'
+
+jobs:
+  validate-changelog:
+    name: Validate Changelog
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'skip-changelog') }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check CHANGELOG.md updated
+        run: |
+          if git diff --name-only origin/${{ github.base_ref }}...HEAD | grep -q '^CHANGELOG.md$'; then
+            echo "CHANGELOG.md has been updated."
+          else
+            echo "::error::CHANGELOG.md has not been updated. Please update the changelog or add the 'skip-changelog' label to opt out."
+            exit 1
+          fi
+