these 2 derivations will be built:
  /nix/store/3l2ppfai60l6xx4v8svhkf3zqk5f1gsg-rootfs-ubuntu-26_04.tar.drv
  /nix/store/h7mk7jgxsipfbgrlxb4l5rrp353j1g6f-container-test-ubuntu-26-04-existing-files.drv