update Installation by manifest script
since v9.0 because of kustomize "metallb.yaml" doesn't have namespace spec
before apply metallb.yaml should apply namespace.yaml first
@@ -45,6 +45,7 @@ Note, you don't need this if you're using kube-router as service-proxy because i
To install MetalLB, apply the manifest:
```shell
+kubectl apply -f https://raw.githubusercontent.com/google/metallb/main/manifests/namespace.yaml
kubectl apply -f https://raw.githubusercontent.com/google/metallb/main/manifests/metallb.yaml
# On first install only
kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"
