Support fixed IP addresses for control node

The variable control_ip_address was documented but not implemented.
Since we support multiple networks, change it to control_ip_addresses
and implement it.

Closes #642.

Author: priteau

docs/production.md

@@ -141,13 +141,13 @@ and referenced from the `site` and `production` environments, e.g.:
     resource "openstack_networking_port_v2" "control" {
         ...
         fixed_ip {
-            subnet_id = data.openstack_networking_subnet_v2.cluster_subnet.id
-            ip_address = var.control_ip_address
+            subnet_id  = data.openstack_networking_subnet_v2.cluster_subnet.id
+            ip_address = (var.control_ip_addresses != {})? var.control_ip_addresses[each.key]: null
         }
     }
     ```
     
-  Note the variable `control_ip_address` is new.
+  Note the variable `control_ip_addresses` is new.
 
   Using fixed IPs will require either using admin credentials or policy changes.
 

environments/skeleton/{{cookiecutter.environment}}/tofu/control.tf

@@ -24,7 +24,8 @@ resource "openstack_networking_port_v2" "control" {
   admin_state_up = "true"
 
   fixed_ip {
-    subnet_id = data.openstack_networking_subnet_v2.cluster_subnet[each.key].id
+    subnet_id  = data.openstack_networking_subnet_v2.cluster_subnet[each.key].id
+    ip_address = (var.control_ip_addresses != {})? var.control_ip_addresses[each.key]: null
   }
 
   no_security_groups = lookup(each.value, "no_security_groups", false)

environments/skeleton/{{cookiecutter.environment}}/tofu/variables.tf

@@ -24,6 +24,12 @@ variable "key_pair" {
     description = "Name of an existing keypair in OpenStack"
 }
 
+variable "control_ip_addresses" {
+    type        = map(string)
+    description = "Mapping of networks to fixed IP addresses used by control node"
+    default     = {}
+}
+
 variable "control_node_flavor" {
     type = string
     description = "Flavor name for control node"