graylog: improve JRE handling

Since the upstream graylogctl script will prefer finding its java
executable based on JAVA_HOME, we now set this instead of PATH in
order to allow it to find the JRE. By setting it conditionally on it
not already being set, we allow selecting a different JRE at runtime.

We also explicitly use openjdk11, which supports the
UseConcMarkSweepGC option which graylog insists on using.

nixos/modules/services/logging/graylog.nix

···
         type = types.package;
         default = pkgs.graylog;
         defaultText = "pkgs.graylog";
-        example = literalExample "pkgs.graylog";
         description = "Graylog package to use.";
       };
 
···
       "d '${cfg.messageJournalDir}' - ${cfg.user} - - -"
     ];
 
-    systemd.services.graylog = with pkgs; {
+    systemd.services.graylog = {
       description = "Graylog Server";
       wantedBy = [ "multi-user.target" ];
       environment = {
-        JAVA_HOME = jre;
         GRAYLOG_CONF = "${confFile}";
       };
-      path = [ pkgs.jre_headless pkgs.which pkgs.procps ];
+      path = [ pkgs.which pkgs.procps ];
       preStart = ''
         rm -rf /var/lib/graylog/plugins || true
         mkdir -p /var/lib/graylog/plugins -m 755

pkgs/tools/misc/graylog/default.nix

···
-{ lib, stdenv, fetchurl, makeWrapper, jre_headless, nixosTests }:
+{ lib, stdenv, fetchurl, makeWrapper, openjdk11_headless, nixosTests }:
 
 stdenv.mkDerivation rec {
   pname = "graylog";
···
   dontStrip = true;
 
   nativeBuildInputs = [ makeWrapper ];
-  makeWrapperArgs = [ "--prefix" "PATH" ":" "${jre_headless}/bin" ];
+  makeWrapperArgs = [ "--set-default" "JAVA_HOME" "${openjdk11_headless}" ];
 
   passthru.tests = { inherit (nixosTests) graylog; };