Protect `asf-site` branch
diff --git a/.asf.yaml b/.asf.yaml
index 3902557..174db6c 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -1,3 +1,7 @@
+github:
+  protected_branches:
+    asf-site: {}
+
 notifications:
   commits:      commits@logging.apache.org
   issues:       notifications@logging.apache.org