Add kubeadm example (#4)

* Add kubeadm example

* Fix dns

---------

Co-authored-by: Fedor Batonogov <f.batonogov@yandex.ru>

opentofu/kubeadm/provider.tf

@@ -0,0 +1,17 @@
+terraform {
+  required_providers {
+    proxmox = {
+      source  = "bpg/proxmox"
+      version = ">= 0.51.0"
+    }
+  }
+}
+
+provider "proxmox" {
+  endpoint  = var.virtual_environment_endpoint
+  api_token = var.virtual_environment_api_token
+  insecure  = true
+  ssh {
+    agent = false
+  }
+}