[v1.30] fix(hetzner): hostname label is not considered

The Node Group info we currently return does not include the
`kubernetes.io/hostname` label, which is usually set on every node.

This causes issues when the user has an unscheduled pod with a
`topologySpreadConstraint` on `topologyKey: kubernetes.io/hostname`.
cluster-autoscaler is unable to fulfill this constraint and does not
scale up any of the node groups.

Related to kubernetes#6715

cluster-autoscaler/cloudprovider/hetzner/hetzner_node_group.go

@@ -19,13 +19,12 @@ package hetzner
 import (
 	"context"
 	"fmt"
+	"maps"
 	"math/rand"
 	"strings"
 	"sync"
 	"time"
 
-	"maps"
-
 	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -229,10 +228,14 @@ func (n *hetznerNodeGroup) TemplateNodeInfo() (*schedulerframework.NodeInfo, err
 		return nil, fmt.Errorf("failed to create resource list for node group %s error: %v", n.id, err)
 	}
 
+	nodeName := newNodeName(n)
+
 	node := apiv1.Node{
 		ObjectMeta: metav1.ObjectMeta{
-			Name:   newNodeName(n),
-			Labels: map[string]string{},
+			Name: nodeName,
+			Labels: map[string]string{
+				apiv1.LabelHostname: nodeName,
+			},
 		},
 		Status: apiv1.NodeStatus{
 			Capacity:   resourceList,