ci: comment about coverage after min. 3 builds (#27544)

[skip ci]
diff --git a/codecov.yml b/codecov.yml
index a8da340..67bd445 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -11,6 +11,7 @@
 comment:
   layout: "diff, files"
   require_changes: true
-  
+  after_n_builds: 3
+
 ignore:
   - "erpnext/demo"