feat: Add Traefik option for ingress values.yaml; Add condition for t…

[dantech2000]

Summary

This PR adds optional Traefik ingress controller support to the generic service Helm chart while maintaining full backward compatibility with the existing nginx-nlb ingress configuration.

Changes

1. templates/ingress.yaml- Added conditional rendering based on ingress.class:

   • Uses spec.ingressClassName field for Traefik (vs annotation for nginx-nlb)
   • Uses Prefix pathType for Traefik (vs ImplementationSpecific for nginx-nlb)
   • Uses numeric port 80 for Traefik (vs named port http for nginx-nlb)

2. values.yaml - Added new configuration options:

   • ingress.class: Choose ingress controller (nginx-nlb or traefik)
   • ingress.traefik: Traefik-specific settings (annotations, ingressClassName)
   • ci/traefik-ingress-values.yaml - Added CI test configuration

Usage

Default (nginx-nlb) - unchanged:

ingress:
  enabled: true
  hosts:
    - host: myapp.codecademy.com
      paths: ['/']
      

Opt-in to Traefik:

ingress:
  enabled: true
  class: traefik
  hosts:
    - host: myapp.codecademy.com
      paths: ['/']
  traefik:
    annotations:
      traefik.ingress.kubernetes.io/router.middlewares: my-middleware@kubernetescrd

Backward Compatibility

• Existing configurations continue to work without changes
• Default remains nginx-nlb when ingress.class is not specified
• No breaking changes to existing deployments

Testing

• helm lint passes
• Template rendering verified for both nginx-nlb and Traefik modes