add first terraform project with bpg-proxmox (not working)

terraform/bgp-simple-vm/provider.tf

@@ -0,0 +1,17 @@
+terraform {
+  required_providers {
+    proxmox = {
+      source  = "bpg/proxmox"
+    }
+  }
+}
+
+provider "proxmox" {
+  endpoint = var.proxmox_endpoint
+  api_token = var.proxmox_api_token
+  insecure = false
+  ssh {
+    agent    = true
+    username = "root"
+  } 
+}