these 2 derivations will be built:
  /nix/store/z35hxsn1ql44kcsybiba173iz1v5rksx-rootfs-ubuntu-26_04.tar.drv
  /nix/store/2pr98vf4i66z8n04cpyxl0dzqlsy1znq-container-test-ubuntu-26-04-example.drv