these 2 derivations will be built:
  /nix/store/bslzdkvdnprp1cjwnhhbfkvla69zspq6-rootfs-ubuntu-22_04.drv
  /nix/store/3x1rfk1xhs2qjjy7mrb8mj9k3j2bikhr-container-test-ubuntu-22-04-existing-files.drv