services/murmur: migrate to parsons

hosts/hainich/configuration.nix

@@ -5,7 +5,6 @@
     ../../common
     ./encboot.nix
     ./hardware.nix
-    ./services/murmur.nix
     ./services/mail.nix
     ./services/hedgedoc_hacc.nix
     ./services/hedgedoc_i4f.nix

hosts/parsons/configuration.nix

@@ -11,6 +11,7 @@
     ../../services/nextcloud
     ../../services/mattermost.nix
     ../../services/thelounge.nix
+    ../../services/murmur.nix
   ];
 
   hexchen.encboot = {

services/murmur.nix

@@ -1,8 +1,4 @@
-{ config, lib, pkgs, ... }:
-
-let
-  sources = import ../../../nix/sources.nix;
-in
+{ config, lib, pkgs, sources, ... }:
 
 let
   mumblesite = pkgs.stdenv.mkDerivation {
@@ -18,6 +14,8 @@ let
   };
 in
 {
+  hexchen.bindmounts."/var/lib/murmur" = "/persist/var/lib/murmur";
+
   services.murmur = {
     enable = true;
     logDays = -1;