Add OpenFaaS Pro queue-worker to faas-netes helm chart

[alexellis]

Signed-off-by: Alex Ellis (OpenFaaS Ltd) alexellis2@gmail.com

Description

Add OpenFaaS Pro queue-worker to faas-netes helm chart

This PR enables retries and backoff for Pro customers through an enhanced queue-worker.

See, the per-queue-worker configuration:

  maxRetryAttempts: "10"
  maxRetryWait: "120s"
  initialRetryWait: "10s"
  httpRetryCodes: "429,502,500,504,408"

To enable it, set queueWorkerPro.enabled=true with helm or arkade

Motivation and Context

The OpenFaaS Pro queue-worker is a new feature for paying customers

How Has This Been Tested?

Running kubectl logs -n openfaas deploy/queue-worker showed the new worker taking over when installed with helm, then I was able to run an async invocation against nodeinfo and see its response executing. I also confirmed that the existing queue-worker carried on workign when the pro version was disabled.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.