Replace template provider with internal function

Untested

.terraform.lock.hcl

@@ -100,18 +100,6 @@ provider "registry.opentofu.org/hashicorp/random" {
   ]
 }
 
-provider "registry.opentofu.org/hashicorp/template" {
-  version = "2.2.0"
-  hashes = [
-    "h1:tdS0otiAtvUV8uLJWJNfcqOPo3llj7FyRzExw6X1srY=",
-    "zh:374c28bafc43cd65e578cb209efc9eee4c1cec7618f451528e928db98059e8c8",
-    "zh:6a2982e70fbc2ab2668d624c648ef2eb32243c1a1185246b03991a7a21326db9",
-    "zh:af83169c21bb13f141510a349e1f70cf7d893247a269bd71cad74dd22f1df0f5",
-    "zh:b81a5bedc91a1a81b938c393247248d6c3d1bd8ea685541f9c858908c0afb6b3",
-    "zh:de15486244af2d29d44d510d647cd6e0b1408e89952261013c572b7c9bfd744b",
-  ]
-}
-
 provider "registry.opentofu.org/hashicorp/time" {
   version = "0.13.0"
   hashes = [

modules/infrastructure/hcloud.tf

@@ -3,15 +3,6 @@ resource "hcloud_ssh_key" "default" {
   public_key = var.default_ssh_key.public_key
 }
 
-data "template_file" "cloud_init" {
-  template = file("./templates/cloud-init.yaml.tpl")
-
-  vars = {
-    tailscale_authkey = tailscale_tailnet_key.cloud_init_key.key
-    default_ssh_key   = var.default_ssh_key.public_key
-  }
-}
-
 resource "hcloud_placement_group" "default" {
   name = "serguzim.net"
   type = "spread"
@@ -43,7 +34,10 @@ resource "hcloud_server" "nodes" {
   image       = each.value.image
   server_type = each.value.server_type
   ssh_keys    = [hcloud_ssh_key.default.id]
-  user_data   = data.template_file.cloud_init.rendered
+  user_data   = templatefile("./templates/cloud-init.yaml.tpl", {
+    tailscale_authkey = tailscale_tailnet_key.cloud_init_key.key,
+    default_ssh_key   = var.default_ssh_key.public_key
+  })
   placement_group_id = hcloud_placement_group.default.id
   public_net {
     ipv4 = hcloud_primary_ip.node_ipv4_addresses[each.key].id