these 2 derivations will be built:
  /nix/store/3l2ppfai60l6xx4v8svhkf3zqk5f1gsg-rootfs-ubuntu-26_04.tar.drv
  /nix/store/dwi5zh8nmsscifvaw7g16as69sx4g59c-container-test-ubuntu-26-04-example.drv