feat(crd): add CredentialBasicAuth

[pmalek]

What this PR does / why we need it:

This PR adds CredentialBasicAuth CRD which will be used by KGO.

Resources of this type will be created when KongConsumer will use a Secret as credential. This will result in CredentialBasicAuth being created, constituting a 1:1 mapping with a credential resource in Konnect.

Which issue this PR fixes

Related to Kong/gateway-operator#617

Special notes for your reviewer:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect significant changes

[randmonkey]

So a CredentialBasicAuth represents a relationship that a KongConsumer referencing a Secret as a basic auth credential attached to the consumer?

[pmalek]

So a CredentialBasicAuth represents a relationship that a KongConsumer referencing a Secret as a basic auth credential attached to the consumer?

Yes, that's the idea. If more Consumers use the same credential (not sure how realistic use case this is) this will create multiple credential objects for each usage.

[pmalek]

Blocked for now before we get consensus on how this should look like:

https://kongstrong.slack.com/archives/C079GK3KB9R/p1726735862213059

[pmalek]

Unblocked.

This for now will contain only the consumer ref and verbatim credential field.

This will replace the "old" way of binding consumers to credentials (Secrets) using the credentials field on the consumer. Instead users will be able to use this (and other types of credential CRDs) to bind consumers to credentials.

In the future we'll be able to provide support for "old" way of binding - using the credentials field - by an implementation of an additional reconciler as in Kong/gateway-operator#623.

[czeslavo]

One afterthought I just had: shouldn't we name the CRD KongCredentialBasicAuth (with the Kong prefix) for the sake of consistency with the rest of the resources?

[pmalek]

One afterthought I just had: shouldn't we name the CRD KongCredentialBasicAuth (with the Kong prefix) for the sake of consistency with the rest of the resources?

I was thinking about this one and went with no prefix. If you feel that would make it more consistent (which in hindsight seems like it would) I can make the change 👍

[czeslavo]

Yeah, I think we should keep it consistent. 👍