these 2 derivations will be built:
  /nix/store/9fk91yvjl0dr23lwykiwfkblbz1zqrw1-rootfs-ubuntu-26_04.drv
  /nix/store/4cgjb8q9iaqbh45dm1mf68hbjg0fqixc-container-test-ubuntu-26-04-existing-files.drv