Add LoadBalancerClass support in EventListener

[nicolasbernard]

Changes

Add the ability to define the service spec.loadBalancerClass for EventListener with a Service of type LoadBalancer.

It's useful if your cluster has multiples LoadBalancer controllers and you need to choose on which one you want to expose the EventListener, for example you can have one controller for public IPs and another for privates IPs.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including functionality, content, code)
• Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings). See some examples of good release notes.
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

EventListners have a new field letting you choose on which LoadBalancer you want to expose the underlying service if you have severals.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: nicolasbernard / name: Nicolas BERNARD (e94f8f5)

[tekton-robot]

Hi @nicolasbernard. Thanks for your PR.

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[nicolasbernard]

/kind feature

[khrm]

/ok-to-test

[khrm]

@nicolasbernard Please sign the cla.

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[nicolasbernard]

@nicolasbernard Please sign the cla.

I did, at least I tried, if the bot didn't update, it means I did something wrong?

Edit: Should be good.

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[savitaashture]

Thank you @nicolasbernard

Two things

1. Can you update PR description about the usecase behind this feature basically give an end user usecase
2. Add release note section as there is a new field support

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[savitaashture]

/assign @dibyom @khrm

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: savitaashture

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[khrm]

@nicolasbernard Can you please rebase this asap so that we can include this in the current release?

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1beta1/event_listener_validation.go	97.3%	97.4%	0.0

[nicolasbernard]

@khrm Should be good, thanks you for making it happen :)

[khrm]

/lgtm