Update 'configuration.nix'

configuration.nix

@@ -156,8 +156,34 @@ git
 
 #source of this code: https://github.com/NixOS/nixpkgs/blob/nixos-22.11/nixos/modules/system/boot/tmp.nix
 
-boot.tmpOnTmpfs = true;
+#boot.tmpOnTmpfs = true;
-boot.cleanTmpDir = true;
+#boot.cleanTmpDir = true;
 
+options = {
+
+    boot.cleanTmpDir = mkOption {
+      type = types.bool;
+      default = true;
+      description = lib.mdDoc ''
+        Whether to delete all files in {file}`/tmp` during boot.
+      '';
+    };
+
+    boot.tmpOnTmpfs = mkOption {
+      type = types.bool;
+      default = true;
+      description = lib.mdDoc ''
+         Whether to mount a tmpfs on {file}`/tmp` during boot.
+      '';
+    };
+
+    boot.tmpOnTmpfsSize = mkOption {
+      type = types.oneOf [ types.str types.types.ints.positive ];
+      default = "50%";
+      description = lib.mdDoc ''
+        Size of tmpfs in percentage.
+        Percentage is defined by systemd.
+      '';
+    };
 
 }