✨ Add LoadBalancerProviderRef (ionos-cloud#169)

**What is the purpose of this pull request/Why do we need it?**

**Issue #, if available:**

**Description of changes:**

**Special notes for your reviewer:**

**Checklist:**
- [ ] Documentation updated
- [ ] Unit Tests added
- [ ] E2E Tests added
- [x] Includes
[emojis](https://github.com/kubernetes-sigs/kubebuilder-release-tools?tab=readme-ov-file#kubebuilder-project-versioning)

api/v1alpha1/ionoscloudcluster_types.go

@@ -53,6 +53,10 @@ type IonosCloudClusterSpec struct {
 	// CredentialsRef is a reference to the secret containing the credentials to access the IONOS Cloud API.
 	//+kubebuilder:validation:XValidation:rule="has(self.name) && self.name != ''",message="credentialsRef.name must be provided"
 	CredentialsRef corev1.LocalObjectReference `json:"credentialsRef"`
+
+	// LoadBalancerProviderRef is a reference to the load balancer provider configuration.
+	// An empty loadBalancerProviderRef field is allowed and means to disable any load balancer logic.
+	LoadBalancerProviderRef *corev1.LocalObjectReference `json:"loadBalancerProviderRef,omitempty"`
 }
 
 // IonosCloudClusterStatus defines the observed state of IonosCloudCluster.

api/v1alpha1/ionoscloudcluster_types_test.go

@@ -58,6 +58,9 @@ func defaultCluster() *IonosCloudCluster {
 			},
 			Location:       "de/txl",
 			CredentialsRef: corev1.LocalObjectReference{Name: "secret-name"},
+			LoadBalancerProviderRef: &corev1.LocalObjectReference{
+				Name: "fake-lb-provider",
+			},
 		},
 	}
 }

config/crd/bases/infrastructure.cluster.x-k8s.io_ionoscloudclusters.yaml

@@ -96,6 +96,19 @@ spec:
                 x-kubernetes-validations:
                 - message: credentialsRef.name must be provided
                   rule: has(self.name) && self.name != ''
+              loadBalancerProviderRef:
+                description: |-
+                  LoadBalancerProviderRef is a reference to the load balancer provider configuration.
+                  An empty loadBalancerProviderRef field is allowed and means to disable any load balancer logic.
+                properties:
+                  name:
+                    description: |-
+                      Name of the referent.
+                      More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
+                      TODO: Add other useful fields. apiVersion, kind, uid?
+                    type: string
+                type: object
+                x-kubernetes-map-type: atomic
               location:
                 description: Location is the location where the data centers should
                   be located.

config/crd/bases/infrastructure.cluster.x-k8s.io_ionoscloudclustertemplates.yaml

@@ -88,6 +88,19 @@ spec:
                         x-kubernetes-validations:
                         - message: credentialsRef.name must be provided
                           rule: has(self.name) && self.name != ''
+                      loadBalancerProviderRef:
+                        description: |-
+                          LoadBalancerProviderRef is a reference to the load balancer provider configuration.
+                          An empty loadBalancerProviderRef field is allowed and means to disable any load balancer logic.
+                        properties:
+                          name:
+                            description: |-
+                              Name of the referent.
+                              More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
+                              TODO: Add other useful fields. apiVersion, kind, uid?
+                            type: string
+                        type: object
+                        x-kubernetes-map-type: atomic
                       location:
                         description: Location is the location where the data centers
                           should be located.