feat: fixed how sometimes updating servers mean that ye had to reset teh MAC address in Proxmox.

This is done by letting each server manage its own network interface.

applications/_base.nix

@@ -42,6 +42,16 @@ in {
         type = types.str;
         default = "${cfg.host.name}.skynet.ie";
       };
+      interface = mkOption {
+        type = types.str;
+        description = "Will most likely be ``eno1`` for physical servers.";
+        default = "eth0";
+      };
+      cidr = mkOption {
+        type = types.int;
+        description = "Most of our servers are /26, ";
+        default = 26;
+      };
     };
   };
 
@@ -60,6 +70,20 @@ in {
       }
     ];
 
+    # set
+    networking = {
+      hostName = cfg.host.name;
+      defaultGateway.interface = lib.mkForce cfg.host.interface;
+
+      # needs to have an address statically assigned
+      interfaces."${cfg.host.interface}".ipv4.addresses = [
+        {
+          address = cfg.host.ip;
+          prefixLength = cfg.host.cidr;
+        }
+      ];
+    };
+
     services.nginx = {
       virtualHosts = {
         # for every server unless explisitly defined redirect the ip to skynet.ie