these 2 derivations will be built:
  /nix/store/ygym7hrflbh4wqn1yh9y6xgf9a1bsjyh-rootfs-ubuntu-26_04.tar.drv
  /nix/store/zlrxnv899n2354pdccx8ddzf55msq6bf-container-test-ubuntu-26-04-nix-flakes.drv