ci: add a PR best practices check

.github/workflows/pr_best_practices.yml

@@ -0,0 +1,14 @@
+name: "Verify PR best practices"
+
+on:
+  pull_request_target:
+    branches: [ main ]
+
+jobs:
+  pr-best-practices:
+    runs-on: ubuntu-latest
+    steps:
+      - name: PR best practice check
+        uses: osbuild/pr-best-practices@main
+        with:
+          token: ${{ secrets.SCHUTZBOT_GITHUB_ACCESS_TOKEN }}