Update app label (again)

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

Author: funkypenguin

charts/docker-mailserver/templates/configmap.yaml

@@ -5,7 +5,7 @@ apiVersion: "v1"
 kind: "ConfigMap"
 metadata:
   labels:
-    app: {{ template "dockermailserver.fullname" . }}
+    app.kubernetes.io/name: {{ template "dockermailserver.fullname" . }}
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
     heritage: "{{ .Release.Service }}"
     release: "{{ .Release.Name }}"