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/setupkeyspec.go

@@ -15,6 +15,8 @@ type SetupKeySpecApplyConfiguration struct {
 	Ephemeral *bool `json:"ephemeral,omitempty"`
 	// Duration sets how long the setup key is valid for.
 	Duration *v1.Duration `json:"duration,omitempty"`
+	// Groups that will be automatically assigned to resources using setup key.
+	AutoGroups []ResourceReferenceApplyConfiguration `json:"autoGroups,omitempty"`
 }
 
 // SetupKeySpecApplyConfiguration constructs a declarative configuration of the SetupKeySpec type for use with
@@ -38,3 +40,16 @@ func (b *SetupKeySpecApplyConfiguration) WithDuration(value v1.Duration) *SetupK
 	b.Duration = &value
 	return b
 }
+
+// WithAutoGroups adds the given value to the AutoGroups field in the declarative configuration
+// and returns the receiver, so that objects can be build by chaining "With" function invocations.
+// If called multiple times, values provided by each call will be appended to the AutoGroups field.
+func (b *SetupKeySpecApplyConfiguration) WithAutoGroups(values ...*ResourceReferenceApplyConfiguration) *SetupKeySpecApplyConfiguration {
+	for i := range values {
+		if values[i] == nil {
+			panic("nil value passed to WithAutoGroups")
+		}
+		b.AutoGroups = append(b.AutoGroups, *values[i])
+	}
+	return b
+}