Add a CI so we remember to add entries to the changelog for every PR.

Author: kellertuer

.github/workflows/changelog.yml

@@ -0,0 +1,12 @@
+name: Check Changelog
+on:
+  pull_request:
+
+jobs:
+  Check-Changelog:
+    name: Check Changelog Action
+    runs-on: ubuntu-latest
+    steps:
+      - uses: tarides/changelog-check-action@v3
+        with:
+          changelog: Changelog.md