jetty_11,jetty_12: init

pkgs/servers/http/jetty/11.x.nix

···
+import ./common.nix {
+  version = "11.0.18";
+  hash = "sha256-HxtO2r6YWo6+MAYUgk7dNSPDqQZoyO9t/8NdI5pPkL4=";
+}

pkgs/servers/http/jetty/12.x.nix

···
+import ./common.nix {
+  version = "12.0.3";
+  hash = "sha256-Z/jJKKzoqTPZnoFOMwbpSd/Kd1w+rXloKH+aw6aNrKs=";
+}

pkgs/servers/http/jetty/default.nix pkgs/servers/http/jetty/common.nix

···
+{ version, hash }:
+
 { lib, stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
   pname = "jetty";
-  version = "12.0.3";
+
+  inherit version;
 
   src = fetchurl {
     url = "mirror://maven/org/eclipse/jetty/jetty-home/${version}/jetty-home-${version}.tar.gz";
-    hash = "sha256-Z/jJKKzoqTPZnoFOMwbpSd/Kd1w+rXloKH+aw6aNrKs=";
+    inherit hash;
   };
 
   dontBuild = true;

pkgs/top-level/all-packages.nix

···
 
   jboss_mysql_jdbc = callPackage ../servers/http/jboss/jdbc/mysql { };
 
-  jetty = callPackage ../servers/http/jetty { };
+  jetty = jetty_12;
+  jetty_12 = callPackage ../servers/http/jetty/12.x.nix { };
+  jetty_11 = callPackage ../servers/http/jetty/11.x.nix { };
 
   jibri = callPackage ../servers/jibri { };