nixos/garage: support 0.9.0+ data_dir format

          data_dir = mkOption {

            default = "/var/lib/garage/data";

            type = types.path;

            description = "The main data storage, put this on your large storage (e.g. high capacity HDD)";

            example = [ {

              path = "/var/lib/garage/data";

              capacity = "2T";

            } ];

            type = with types; either path (listOf attrs);

            description = ''

              The directory in which Garage will store the data blocks of objects. This folder can be placed on an HDD.

              Since v0.9.0, Garage supports multiple data directories, refer to https://garagehq.deuxfleurs.fr/documentation/reference-manual/configuration/#data_dir for the exact format.

            '';

          };

        };

      };