nixos/nginx: Add an option to specify additional third-party modules

nixos/modules/services/web-servers/nginx/default.nix

@@ -397,6 +397,9 @@ in
         default = pkgs.nginxStable;
         defaultText = "pkgs.nginxStable";
         type = types.package;
+        apply = p: p.override {
+          modules = p.modules ++ cfg.additionalModules;
+        };
         description = "
           Nginx package to use. This defaults to the stable version. Note
           that the nginx team recommends to use the mainline version which
@@ -404,6 +407,17 @@ in
         ";
       };
 
+      additionalModules = mkOption {
+        default = [];
+        type = types.listOf (types.attrsOf types.anything);
+        example = literalExample "[ pkgs.nginxModules.brotli ]";
+        description = ''
+          Additional <link xlink:href="https://www.nginx.com/resources/wiki/modules/">third-party nginx modules</link>
+          to install. Packaged modules are available in
+          <literal>pkgs.nginxModules</literal>.
+        '';
+      };
+
       logError = mkOption {
         default = "stderr";
         type = types.str;