feat: Make the cluster name configurable (#1379)

bootstrap/templates/kubernetes/bootstrap/talos/talconfig.yaml.j2

@@ -5,7 +5,7 @@ talosVersion: v1.6.6
 # renovate: datasource=docker depName=ghcr.io/siderolabs/kubelet
 kubernetesVersion: v1.29.3
 
-clusterName: &cluster home-kubernetes
+clusterName: &cluster #{ bootstrap_cluster_name|default('home-kubernetes', true) }#
 endpoint: https://#{ bootstrap_controllers_vip }#:6443
 clusterPodNets:
   - "#{ bootstrap_pod_network.split(',')[0] }#"