update zone-sync headless service selector label (#7445)

Author: pdabelf5

charts/nginx-ingress/templates/_helpers.tpl

@@ -58,6 +58,7 @@ helm.sh/chart: {{ include "nginx-ingress.chart" . }}
 app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
 {{- end }}
 app.kubernetes.io/managed-by: {{ .Release.Service }}
+zone-sync.nginx.com/name: {{ .Chart.Name }}
 {{- end }}
 
 {{/*
@@ -86,6 +87,7 @@ Selector labels
 {{ toYaml .Values.controller.selectorLabels }}
 {{- else -}}
 app.kubernetes.io/name: {{ include "nginx-ingress.name" . }}
+zone-sync.nginx.com/name: {{ include "nginx-ingress.name" . }}
 app.kubernetes.io/instance: {{ .Release.Name }}
 {{- end -}}
 {{- end -}}