feat: add node pool module and use it for new node pool

modules/node-pool/v1/main.tf

@@ -0,0 +1,45 @@
+resource "random_string" "suffix" {
+  length  = 4
+  special = false
+  upper   = false
+}
+
+resource "hcloud_network_subnet" "pool" {
+  network_id   = var.network_id
+  type         = "cloud"
+  network_zone = "eu-central"
+  ip_range     = var.subnet_cidr
+}
+
+resource "hcloud_server" "pool" {
+  count = var.size
+
+  name        = "pool-${random_string.suffix.result}-${count.index + 1}"
+  image       = var.image
+  server_type = var.server_type
+  location    = var.location
+
+  backups                  = false
+  shutdown_before_deletion = true
+
+  placement_group_id = var.placement_group_id
+
+  ssh_keys = var.ssh_key_ids
+
+  labels = {
+    "k8s.node.role"    = "worker"
+    "k8s.node.name"    = "pool-${random_string.suffix.result}-${count.index}"
+    "k8s.cluster.name" = var.cluster_name
+    "k8s.node.pool"    = random_string.suffix.result
+  }
+
+  public_net {
+    ipv4_enabled = true
+    ipv6_enabled = false
+  }
+
+  network {
+    network_id = var.network_id
+    ip         = cidrhost(hcloud_network_subnet.pool.ip_range, count.index + 1)
+  }
+}