rework stirling-pdf to be more generic with test

modules/clan/stirling-pdf/default.nix

@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ ... }:
 {
   _class = "clan.service";
   manifest.name = "stirling-pdf";
@@ -6,43 +6,18 @@
   manifest.categories = [ "System" ];
 
   roles.default = {
-    interface.options = {
-      domain = lib.mkOption {
-        type = lib.types.str;
-        default = "pdf";
-        description = "Sub domain or Stirling PDF service";
-      };
-    };
-
-    perInstance =
+    perInstance.nixosModule =
       {
-        settings,
+        lib,
         ...
       }:
       {
-        nixosModule =
-          {
-            config,
-            ...
-          }:
-          let
-            domain = "${settings.domain}.${config.networking.fqdn}";
-          in
-          {
-            services.stirling-pdf = {
-              enable = true;
-              environment = {
-                SERVER_PORT = 8080;
-              };
-            };
-            services.nginx.virtualHosts."${domain}" = {
-              forceSSL = true;
-              useACMEHost = "${config.networking.fqdn}";
-              locations."/" = {
-                proxyPass = "http://localhost:${builtins.toString config.services.stirling-pdf.environment.SERVER_PORT}";
-              };
-            };
+        services.stirling-pdf = {
+          enable = lib.mkDefault true;
+          environment = {
+            SERVER_PORT = lib.mkDefault 8080;
           };
+        };
       };
   };
 }