OpenStack: add support to multiple subnets in the bootstrap

Installations with dual-stack requires the bootstrap node to have
one IPv4 and IPv6 Subnet. While the masters already have support
for it derived from failure domains work, the bootstrap does not.
This commit add support for multiple subnets and ip addresses.

Author: MaysaMacedo

data/data/openstack/bootstrap/main.tf

@@ -48,8 +48,13 @@ resource "openstack_networking_port_v2" "bootstrap_port" {
     value = var.cluster_domain
   }
 
-  fixed_ip {
-    subnet_id = var.nodes_subnet_id
+  dynamic "fixed_ip" {
+    for_each = var.nodes_default_port.fixed_ips
+
+    content {
+      subnet_id  = fixed_ip.value["subnet_id"]
+      ip_address = fixed_ip.value["ip_address"]
+    }
   }
 
   dynamic "allowed_address_pairs" {

data/data/openstack/bootstrap/variables.tf

@@ -7,8 +7,14 @@ variable "private_network_id" {
   type = string
 }
 
-variable "nodes_subnet_id" {
-  type = string
+variable "nodes_default_port" {
+  type = object({
+    network_id = string
+    fixed_ips = list(object({
+      subnet_id  = string
+      ip_address = string
+    }))
+  })
 }
 
 variable "master_port_ids" {

data/data/openstack/masters/outputs.tf

@@ -21,6 +21,6 @@ output "private_network_id" {
   value = local.nodes_default_port.network_id
 }
 
-output "nodes_subnet_id" {
-  value = local.nodes_default_port.fixed_ips[0].subnet_id
+output "nodes_default_port" {
+  value = local.nodes_default_port
 }