feat[server]: add mailserver

hosts/nixos/x86_64-linux/eagleland/default.nix

@@ -0,0 +1,82 @@
+{ lib, config, minimal, ... }:
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./disk-config.nix
+  ];
+
+  topology.self = {
+    icon = "devices.cloud-server";
+  };
+
+  networking = {
+    useDHCP = lib.mkForce false;
+    useNetworkd = true;
+    dhcpcd.enable = false;
+    renameInterfacesByMac = lib.mapAttrs (_: v: v.mac) (
+      config.repo.secrets.local.networking.networks or { }
+    );
+  };
+  boot.initrd.systemd.network = {
+    enable = true;
+    networks = {
+      inherit (config.systemd.network.networks) "10-wan";
+    };
+  };
+
+  systemd = {
+    network = {
+      enable = true;
+      wait-online.enable = false;
+      networks =
+        let
+          netConfig = config.repo.secrets.local.networking;
+        in
+        {
+          "10-wan" = {
+            address = [
+              "${netConfig.wanAddress4}/32"
+              "${netConfig.wanAddress6}/64"
+            ];
+            gateway = [ "fe80::1" ];
+            routes = [
+              { Destination = netConfig.defaultGateway4; }
+              {
+                Gateway = netConfig.defaultGateway4;
+                GatewayOnLink = true;
+              }
+            ];
+            matchConfig.MACAddress = netConfig.networks.${config.swarselsystems.server.localNetwork}.mac;
+            networkConfig.IPv6PrivacyExtensions = "yes";
+            linkConfig.RequiredForOnline = "routable";
+          };
+        };
+    };
+  };
+
+  swarselmodules.server.mailserver = true;
+
+  swarselsystems = {
+    flakePath = "/root/.dotfiles";
+    info = "2vCPU, 4GB Ram";
+    isImpermanence = true;
+    isSecureBoot = false;
+    isCrypted = true;
+    isCloud = true;
+    isSwap = true;
+    swapSize = "4G";
+    rootDisk = "/dev/sda";
+    isBtrfs = true;
+    isNixos = true;
+    isLinux = true;
+    proxyHost = "eagleland";
+    server = {
+      inherit (config.repo.secrets.local.networking) localNetwork;
+    };
+  };
+} // lib.optionalAttrs (!minimal) {
+  swarselprofiles = {
+    server = true;
+  };
+
+}