nixos, terraform: minor updates

terraform/vault.tf

@@ -1,9 +1,9 @@
 provider "vault" {
-  address = "http://10.42.42.6:8200"
+  address = "http://vault:8200"
   skip_tls_verify = true
 }
 
 # Proxmox authentication for terraform
 data "vault_generic_secret" "proxmox_auth" {
-    path = "secrets/proxmox/terraform_auth"
+    path = "secrets/terraform/proxmox_credentials"
 }