feat(cluster): support setting service template in pooler

Needed to be able to set the type of the
pooler service to be a LoadBalancer.

Signed-off-by: Thomas Hartland <thomas.hartland@diamond.ac.uk>

Author: tghartland

charts/cluster/templates/pooler.yaml

@@ -62,4 +62,8 @@ spec:
   template:
     {{- . | toYaml | nindent 4 }}
   {{- end }}
+  {{- with .serviceTemplate }}
+  serviceTemplate:
+    {{- . | toYaml | nindent 4 }}
+  {{- end }}
 {{- end }}