Allow setting custome labels on all resources

[yellowmegaman]

Greetings! Thanks for awesome helm chart and software.

It would be even more awesome if we could set custom labels to all workloads to allow custom workload/log filtering.

Example:

In values.yaml

commonLabels: {}

In workload manifests

  labels:
  {{- include ".Values.commonLabels" . | nindent 4 }}