traefik ingress: ditch default ingressClass in favor of Acorn-only default

[iwilltry42]

Just as one would do using acorn install --ingress-class-name.

Open Questions

• Edge Case: User installs Acorn before installing ingress-controller with the defined ingressClass
  • Acorn wants to install Traefik and set internal default ingressClass to traefik while user defined not-yet-existing ingressClass foobar

[cjellick]

This edge case completely confuses me. What does storageclass have to do with the ingress class?

[iwilltry42]

@cjellick that was just a typo and I think it can be neglected, since that would only affect edge cases for people using Docker for Desktop (as that's the only use case where we install traefik).

[cjellick]

working as expected. i inadvertently tested this while testing various ingress scenarios