ip -> ipv4...

...explictly label current ip values as ipv4, in order to more
easily add ipv6 support later on.

modules/host/main.tf

@@ -64,7 +64,7 @@ resource "hcloud_server" "server" {
 }
 
 resource "hcloud_server_network" "server" {
-  ip        = var.private_ip
+  ip        = var.private_ipv4
   server_id = hcloud_server.server.id
-  subnet_id = var.subnet_id
+  subnet_id = var.ipv4_subnet_id
 }

modules/host/variables.tf

@@ -54,12 +54,12 @@ variable "location" {
   type        = string
 }
 
-variable "subnet_id" {
+variable "ipv4_subnet_id" {
   description = "The subnet id"
   type        = string
 }
 
-variable "private_ip" {
+variable "private_ipv4" {
   description = "Private IP for the server"
   type        = string
 }