Give the technitium LXC a second NIC on the atlashorizon VLAN

Technitium now serves and resolves on 192.168.7.2 as well as its
192.168.0.2 address. The interface was added by hand out of band; this
brings it under management so the next apply does not remove it.

Adopts the module's new nic2 object in place of the VM-only ip2 string.
The submodule bump is a single ref, so it also carries in the Flatcar
module support that the next commit starts using.

Co-Authored-By: Claude Opus 5 <[email protected]>

vars.tf

@@ -59,9 +59,9 @@ variable "dns_records" {
   description = "Manually managed DNS records. Each targets a zone by name (the search_domain zone or one from dns_zones). A record in the search_domain zone whose name matches an auto-added host replaces that host record instead of conflicting with it."
   type = list(object({
     zone     = string
-    name     = string           # subdomain label, or "@" for the zone apex
-    type     = string           # A, AAAA, CNAME, NS, TXT, MX
-    value    = string           # IP / target / text / mail exchanger
+    name     = string # subdomain label, or "@" for the zone apex
+    type     = string # A, AAAA, CNAME, NS, TXT, MX
+    value    = string # IP / target / text / mail exchanger
     ttl      = optional(number)
     priority = optional(number) # required for MX records
   }))
@@ -126,12 +126,18 @@ variable "nodes" {
       ip           = string
       nameserver   = optional(string)
       gw           = string
+      nic2 = optional(object({
+        nic_name = optional(string, "eth1")
+        bridge   = optional(string, "vmbr0")
+        vlan     = optional(number)
+        ip       = string
+        gw       = optional(string)
+      }))
     })), {})
     machines = optional(map(object({
       hostname   = string
       vmid       = number
       ip         = string
-      ip2        = optional(string, null)
       vlan       = optional(number, 0)
       template   = string
       full_clone = bool
@@ -149,6 +155,12 @@ variable "nodes" {
       bios       = string
       machine    = string
       bridge     = string
+      nic2 = optional(object({
+        bridge = optional(string, "vmbr0")
+        vlan   = optional(number)
+        ip     = string
+        gw     = optional(string)
+      }))
     })), {})
   }))
   default = {}