Add support for additinal service labels

[HJK181]

We use the helm-chart in conjunction with Spring-Cloud-Kubernetes. Furthermore, we use Spring-Cloud-Open-Feign to publish messages to Centrifugo. Spring uses a DiscoveryClient for Kubernetes which tells Feign where the request should be routed to. As Centrifugo - by default - uses a single service with many ports, Spring does not know to which port the request should be sent. However, Spring allows to add a Label to a Service whose value should be the service port Feign will use: See the Spring docs for primary-port-name. With this change, it's possible to add

service:
  labels: 
    primary-port-name: "internal"

to the values yaml, making the Feign client work.

[FZambia]

Thanks! Please also bump

helm-charts/charts/centrifugo/Chart.yaml

Line 4 in 56f21f9

version: 11.0.4

to 11.0.5

This is required by CI for releasing.

[HJK181]

Thanks! Please also bump

helm-charts/charts/centrifugo/Chart.yaml

Line 4 in 56f21f9

version: 11.0.4

to 11.0.5

This is required by CI for releasing.

done