gerd.stalwart: add meta

machines/gerd/services/stalwart/default.nix

@@ -1,5 +1,20 @@
+{ config, ... }:
+
 {
   imports = [
     ./stalwart.nix
   ];
+
+  mine.shared.meta.stalwart = {
+    name = "Stalwart Mail";
+    description = "We host our own mailserver, which can be reached on ${config.mine.shared.settings.mail.domain} with your LDAP username and password.";
+
+    package = let
+      pkg = config.services.stalwart-mail.package;
+    in {
+      name = pkg.pname;
+      version = pkg.version;
+      meta = pkg.meta;
+    };
+  };
 }