MINOR: kubernetes-ingress: Add pre-install hook annotation for namespace creation (#254)

Author: astorise

kubernetes-ingress/templates/namespace.yaml

@@ -25,4 +25,7 @@ metadata:
     app.kubernetes.io/managed-by: {{ .Release.Service }}
     app.kubernetes.io/instance: {{ .Release.Name }}
     app.kubernetes.io/version: {{ .Chart.AppVersion }}
+  annotations:
+    "helm.sh/hook": "pre-install"
+    "helm.sh/hook-weight": "-1"
 {{- end -}}