Enforces CHANGELOG entries on PRs

GitHub workflow that verifies if CHANGELOG 'changes' are part of the PR.

.changes/unreleased/internal-20240720-181428.yaml

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+kind: internal
+body: Enforces CHANGELOG entries on PRs
+time: 2024-07-20T18:14:28.964448+02:00
+custom:
+    Issue: ""

.github/workflows/check-changelog.yml

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+name: Require CHANGELOG entry
+
+on:
+  pull_request:
+    types:
+      # On by default if you specify no types.
+      - "opened"
+      - "reopened"
+      - "synchronize"
+      # For `skip-label` only.
+      - "labeled"
+      - "unlabeled"
+
+jobs:
+  check-changelog:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Check for changelog entry"
+        uses: brettcannon/check-for-changed-files@v1
+        with:
+          file-pattern: |
+            .changes/unreleased/*.yaml
+            CHANGELOG.md
+          skip-label: "skip changelog"
+          failure-message: "Missing a changelog file in ${file-pattern}; please add one or apply the ${skip-label} label to the pull request"