feat(service): add support for ipFamilyPolicy and ipFamilies

Author: barbirict

charts/docker-mailserver/templates/service.yaml

@@ -148,3 +148,9 @@ spec:
   {{- if .Values.service.trafficDistribution }}
   trafficDistribution: {{ .Values.service.trafficDistribution }}
   {{- end }}
+
+  ipFamilyPolicy: {{ default "SingleStack" .Values.service.ipFamilyPolicy }}
+  {{- if .Values.service.ipFamilies }}
+  ipFamilies:
+    {{- toYaml .Values.service.ipFamilies | nindent 2 }}
+  {{- end }}

charts/docker-mailserver/values.yaml

@@ -321,6 +321,13 @@ service:
   ##       to allocate a free IP from the pool.
   ## Default: Automatically assign a random IP
   # clusterIp:
+  ## IP family policy for the service. Options: SingleStack, PreferDualStack, RequireDualStack
+  ## Default: SingleStack
+  #ipFamilyPolicy:
+  ## List of IP families to use. Options: IPv4, IPv6
+  ## Order determines preference when ipFamilyPolicy is PreferDualStack or RequireDualStack
+  ## Default: Determined by cluster configuration
+  #ipFamilies:
   annotations: {}
   labels: {}