ci: check if PR updated changelog

Add a new CI workflow that checks whether a PR targeting the main branch
modified the CHANGELOG.md file. This can be disabled by using the "no
changelog" tag when opening the PR

.github/workflows/changelog-check.yml

@@ -0,0 +1,18 @@
+name: Check Changelog
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+    branches:
+      - main
+
+jobs:
+  check-changelog:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: tarides/changelog-check-action@v2
+        with:
+          changelog: CHANGELOG.md
+
+