treewide: reformat with nixfmt-rfc-style

mail-server/environment.nix

@@ -14,15 +14,28 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ config, pkgs, lib, ... }:
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
 
 let
   cfg = config.mailserver;
 in
 {
-  config = with cfg; lib.mkIf enable {
-    environment.systemPackages = with pkgs; [
-      dovecot openssh postfix rspamd
-    ] ++ (if certificateScheme == "selfsigned" then [ openssl ] else []);
-  };
+  config =
+    with cfg;
+    lib.mkIf enable {
+      environment.systemPackages =
+        with pkgs;
+        [
+          dovecot
+          openssh
+          postfix
+          rspamd
+        ]
+        ++ (if certificateScheme == "selfsigned" then [ openssl ] else [ ]);
+    };
 }