these 2 derivations will be built:
  /nix/store/x776r7364bp05xyjjpj9mdzbl1rsfmgn-rootfs-ubuntu-22_04.tar.drv
  /nix/store/1ll2g2fnd5jycsnd6qflfy08b8mlqvaz-container-test-ubuntu-22-04-existing-files.drv