nixos/systemd-repart: add support for repeating settings (#389826)

nixos/modules/image/repart.nix

···
       };
 
       repartConfig = lib.mkOption {
-        type = with lib.types; attrsOf (oneOf [ str int bool ]);
+        type = with lib.types; attrsOf (oneOf [ str int bool (listOf str) ]);
         example = {
           Type = "home";
           SizeMinBytes = "512M";
···
           (lib.mapAttrsToList (_n: v: v.repartConfig.Format or null) cfg.partitions);
 
 
-        format = pkgs.formats.ini { };
+        format = pkgs.formats.ini { listsAsDuplicateKeys = true; };
 
         definitionsDirectory = utils.systemdUtils.lib.definitions
           "repart.d"

nixos/modules/system/boot/systemd/repart.nix

···
   cfg = config.systemd.repart;
   initrdCfg = config.boot.initrd.systemd.repart;
 
-  format = pkgs.formats.ini { };
+  format = pkgs.formats.ini { listsAsDuplicateKeys = true; };
 
   definitionsDirectory = utils.systemdUtils.lib.definitions "repart.d" format (
     lib.mapAttrs (_n: v: { Partition = v; }) cfg.partitions
···
               str
               int
               bool
+              (listOf str)
             ])
           );
         default = { };