rework stirling-pdf to be more generic with test

machines/b4l/services/stirling-pdf.nix

@@ -0,0 +1,26 @@
+{ config, ... }:
+let
+  stDomain = "${config.clan.core.vars.generators.b4l-stirling-pdf.files.subdomain.value}.${config.networking.fqdn}";
+in
+{
+  clan.core.vars.generators.b4l-stirling-pdf = {
+    files.subdomain.secret = false;
+
+    prompts = {
+      subdomain = {
+        persist = true;
+        type = "line";
+        description = "Sub-domain for Stirling PDF app. Default:(pdf)";
+      };
+    };
+    script = ''cat $prompts/subdomain || echo -n "pdf" > $out/subdomain'';
+  };
+
+  services.nginx.virtualHosts."${stDomain}" = {
+    forceSSL = true;
+    useACMEHost = "${config.networking.fqdn}";
+    locations."/" = {
+      proxyPass = "http://localhost:${builtins.toString config.services.stirling-pdf.environment.SERVER_PORT}";
+    };
+  };
+}