init

modules/nixos/common.nix

@@ -1,4 +1,8 @@
-{config, ...}: {
+{
+  config,
+  lib,
+  ...
+}: {
   # flakes usage
   nix.settings.experimental-features = [
     "flakes"
@@ -12,5 +16,5 @@
   # cleans /tmp to maintain a tidy system
   boot.tmp.cleanOnBoot = true;
 
-  networking.domain = config.networking.hostname;
+  networking.domain = lib.mkDefault config.networking.hostName;
 }

modules/nixos/networking/ssh-as-root.nix

@@ -1,3 +1,3 @@
-{
-  services.openssh.settings.PermitRootLogin = "yes";
+{lib, ...}: {
+  services.openssh.settings.PermitRootLogin = lib.mkForce "yes";
 }

modules/nixos/zulip.nix

@@ -15,6 +15,7 @@
       EXTERNAL_HOST = "chat.${config.networking.domain}";
     };
   };
+  services.postgresql.enable = true;
   mailserver.loginAccounts = {
     "zulip+admin@${config.networking.domain}" = {
       hashedPasswordFile = builtins.toString config.age.secrets."mailserver-acc-zulip+admin-pw".path;