Implement group resource (#181)

This change implements a new group resource. 

It also sets the standard for a resource reference will be done through
out the controller. A resource reference can either be done by ID or as
a local named reference to the actual resource. This allows end users to
chose if they want to manage things completely in the cluster or not.

Part of #172

Signed-off-by: Philip Laine <philip.laine@gmail.com>

pkg/applyconfigurations/api/v1alpha1/resourcereference.go

@@ -0,0 +1,38 @@
+// Code generated by controller-gen. DO NOT EDIT.
+
+package v1alpha1
+
+import (
+	v1 "k8s.io/api/core/v1"
+)
+
+// ResourceReferenceApplyConfiguration represents a declarative configuration of the ResourceReference type for use
+// with apply.
+type ResourceReferenceApplyConfiguration struct {
+	// id of the resource in the Netbird API.
+	ID *string `json:"id,omitempty"`
+	// local reference to the object in the same namespace.
+	LocalRef *v1.LocalObjectReference `json:"localRef,omitempty"`
+}
+
+// ResourceReferenceApplyConfiguration constructs a declarative configuration of the ResourceReference type for use with
+// apply.
+func ResourceReference() *ResourceReferenceApplyConfiguration {
+	return &ResourceReferenceApplyConfiguration{}
+}
+
+// WithID sets the ID field in the declarative configuration to the given value
+// and returns the receiver, so that objects can be built by chaining "With" function invocations.
+// If called multiple times, the ID field is set to the value of the last call.
+func (b *ResourceReferenceApplyConfiguration) WithID(value string) *ResourceReferenceApplyConfiguration {
+	b.ID = &value
+	return b
+}
+
+// WithLocalRef sets the LocalRef field in the declarative configuration to the given value
+// and returns the receiver, so that objects can be built by chaining "With" function invocations.
+// If called multiple times, the LocalRef field is set to the value of the last call.
+func (b *ResourceReferenceApplyConfiguration) WithLocalRef(value v1.LocalObjectReference) *ResourceReferenceApplyConfiguration {
+	b.LocalRef = &value
+	return b
+}