add test

.gitea/workflows/render-manifests.yaml

@@ -118,8 +118,10 @@ jobs:
               | while read cmd; do echo "$cmd" | sh; done || true
           done
 
-          echo ">> Update repository cache ..."
-          helm repo update
+          if helm repo list | tail +2 | read -r; then
+            echo ">> Update repository cache ..."
+            helm repo update
+          fi
 
           echo "----"