Move terraform files into modules

modules/infrastructure/tailscale.tf

@@ -0,0 +1,11 @@
+resource "tailscale_tailnet_key" "cloud_init_key" {
+  reusable      = true
+  ephemeral     = false
+  preauthorized = true
+  expiry        = 21600 # 6 hours
+  description   = "Cloud-init key used by opentofu"
+}
+
+data "tailscale_devices" "nodes" {
+  name_prefix = "node"
+}