Merge pull request #186660 from aopom/clickhouse-conf

Change clickhouse's module conf directory to permit overrides

nixos/modules/services/databases/clickhouse.nix

···
         AmbientCapabilities = "CAP_SYS_NICE";
         StateDirectory = "clickhouse";
         LogsDirectory = "clickhouse";
-        ExecStart = "${cfg.package}/bin/clickhouse-server --config-file=${cfg.package}/etc/clickhouse-server/config.xml";
+        ExecStart = "${cfg.package}/bin/clickhouse-server --config-file=/etc/clickhouse-server/config.xml";
       };
     };