Fix creating namespace for cert-manager deployment

scripts/cert-manager/install-cert-manager.sh

@@ -31,16 +31,6 @@ VERSION=v1.11.4
 echo "Installing cert-manager CRD resources ..."
 kubectl apply --validate=false -f https://github.com/jetstack/cert-manager/releases/download/${VERSION}/cert-manager.crds.yaml
 
-# Create the namespace 
-kubectl get ns ${NAMESPACE}
-if [ $? == 0 ]; then
-    echo "Namespace '${NAMESPACE}' already exists."
-else
-    echo "Creating namespace '${NAMESPACE}' ..."
-    kubectl create namespace ${NAMESPACE}
-    echo "Successfully created namespace '${NAMESPACE}'."
-fi
-
 # Add the Jetstack Helm repository.
 echo "Adding Jetstack Helm repository."
 helm repo add jetstack https://charts.jetstack.io
@@ -53,6 +43,7 @@ helm repo update
 echo "Installing cert-manager ${VERSION} to namespace ${NAMESPACE} as '${NAME}' ..."
 helm install \
   --namespace ${NAMESPACE} \
+  --create-namespace \
   --version ${VERSION} \
   ${NAME} \
   jetstack/cert-manager