Add protected branches configuration for main branch

.asf.yaml

@@ -20,6 +20,14 @@ github:
   del_branch_on_merge: true
   features:
     issues: true
+  protected_branches:
+    main:
+      required_status_checks:
+        # strict means "Require branches to be up to date before merging".
+        strict: false
+      required_pull_request_reviews:
+        dismiss_stale_reviews: false
+        required_approving_review_count: 1
 
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