Add netbox provider configuration and secret management

terraform/provider.tf

@@ -9,4 +9,15 @@ terraform {
       version = "5.0.0"
     }
   }
+}
+
+variable netbox_token {
+  type        = string
+  description = "netbox api token"
+  sensitive   = true
+}
+
+provider "netbox" {
+  url   = http://91.98.205.65:8000
+  token = var.netbox_token
 }