these 2 derivations will be built:
  /nix/store/0m41xfns3lkvrf8czmffbcm2rl6ihvzq-rootfs-ubuntu-22_04.tar.drv
  /nix/store/c5hzkffnp5iksy7azqkvf4ryyj72grp8-container-test-ubuntu-22-04-existing-files.drv