nixos/lighttpd: move cgit setup to cgit.nix

To where it really belongs. Separation of concern.

nixos/modules/services/web-servers/lighttpd/cgit.nix

···
       }
     '';
 
+    systemd.services.lighttpd.preStart = ''
+      mkdir -p /var/cache/cgit
+      chown lighttpd:lighttpd /var/cache/cgit
+    '';
+
   };
 
 }

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

···
       description = "Lighttpd Web Server";
       after = [ "network.target" ];
       wantedBy = [ "multi-user.target" ];
-      preStart = ''
-        ${if cfg.cgit.enable then ''
-          mkdir -p /var/cache/cgit
-          chown lighttpd:lighttpd /var/cache/cgit
-        '' else ""}
-      '';
       serviceConfig.ExecStart = "${pkgs.lighttpd}/sbin/lighttpd -D -f ${configFile}";
       # SIGINT => graceful shutdown
       serviceConfig.KillSignal = "SIGINT";