feat: add opentofu remote bucket state storage

opentofu/vms/providers.tf

@@ -7,11 +7,25 @@ terraform {
       version = "0.43.2"
     }
   }
+
+  backend "s3" {
+    bucket = "opentofu-state"
+    region = "us-east-1"
+    key = "lxc/terraform.tfstate"
+    encrypt = false
+
+    skip_credentials_validation = true
+    skip_region_validation      = true
+    skip_requesting_account_id  = true
+    skip_s3_checksum = true
+
+    endpoints = {
+      s3       = "https://a7638f5d66d44acc48d4b80b7c3c8a0c.r2.cloudflarestorage.com"
+    }
+  }
 }
 
 provider "proxmox" {
-  endpoint  = var.proxmox_api_endpoint
-  api_token = var.proxmox_api_token
   insecure  = true
   tmp_dir  = "/var/tmp"
   ssh {