feat(network): add network CIDR variables for enhanced configuration

Introduced variables for network, node, pod, and service IPv4 CIDRs in `variables.tf` to allow dynamic network configuration.

Signed-off-by: Marcel Richter <[email protected]>

network.tf

@@ -1,10 +1,10 @@
 locals {
   # https://github.com/hetznercloud/hcloud-cloud-controller-manager/blob/main/docs/deploy_with_networks.md#considerations-on-the-ip-ranges
-  network_ipv4_cidr        = "10.0.0.0/16"
-  node_ipv4_cidr           = "10.0.1.0/24"
+  network_ipv4_cidr        = var.network_ipv4_cidr
+  node_ipv4_cidr           = var.node_ipv4_cidr
   node_ipv4_cidr_mask_size = split("/", local.node_ipv4_cidr)[1] # 24
-  pod_ipv4_cidr            = "10.0.16.0/20"
-  service_ipv4_cidr        = "10.0.8.0/21"
+  pod_ipv4_cidr            = var.pod_ipv4_cidr
+  service_ipv4_cidr        = var.service_ipv4_cidr
 }
 
 resource "hcloud_network" "this" {

variables.tf

@@ -108,6 +108,30 @@ variable "enable_kube_span" {
   description = "If true, the KubeSpan Feature (with \"Kubernetes registry\" mode) will be enabled."
 }
 
+variable "network_ipv4_cidr" {
+  description = "The main network cidr that all subnets will be created upon."
+  type        = string
+  default     = "10.0.0.0/16"
+}
+
+variable "node_ipv4_cidr" {
+  description = "Node CIDR, used for the nodes (control plane and worker nodes) in the cluster."
+  type        = string
+  default     = "10.0.1.0/24"
+}
+
+variable "pod_ipv4_cidr" {
+  description = "Pod CIDR, used for the pods in the cluster."
+  type        = string
+  default     = "10.0.16.0/20"
+}
+
+variable "service_ipv4_cidr" {
+  description = "Service CIDR, used for the services in the cluster."
+  type        = string
+  default     = "10.0.8.0/21"
+}
+
 # Server
 variable "talos_version" {
   type        = string