add traefik service template

common/templates/traefik/_service.tpl

+# https://doc.traefik.io/traefik/routing/services/#services
+{{- define "common.traefik.service" }}
+apiVersion:  {{ .Values.apiVersion | default "traefik.io/v1alpha1" }}
+kind: TraefikService
+metadata:
+  name: {{ .Values.name | default "service" }}
+  {{- with .Values.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  labels:
+    {{- include "common.variables.labels" . | nindent 4 }}
+spec:
+  {{- with .Values.loadBalancer }}
+  loadBalancer:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- with .Values.weighted }}
+  weighted:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- with .Values.mirroring }}
+  mirroring:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end }}