Discussion: can we drop certificate-class when http01 is archived

[ReToCode]

When net-http01 is removed, there is only one implementation left for KnativeCertificate. We currently have certificate-class with a default value of cert-manager. As there will not be a second implementation, its a bit cumbersome to handle the cert-class in various places without having a second one.

e.g:

func getCertificateClass(cm *corev1.ConfigMap) string {
	// if not specified, we fall back to our default, which is cert-manager
	if class, ok := cm.Data[netcfg.DefaultCertificateClassKey]; ok {
		return class
	}

	return netcfg.CertManagerCertificateClassName
}
...
	class := getCertificateClass(cm)
	switch class {
	case netcfg.CertManagerCertificateClassName:
		return getCertManagerCA(clients)
	default:
		return nil, fmt.Errorf("invalid %s: %s", netcfg.DefaultCertificateClassKey, class)
	}

Let's discuss if we want to drop it.

[github-actions]

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