these 2 derivations will be built:
  /nix/store/s0m9fwj0h7p4iijn1dfdbr95qilrc3fa-rootfs-ubuntu-26_04.tar.drv
  /nix/store/ls5f9qazz4w2m9djc1am5hfbs9mjc7g4-container-test-ubuntu-26-04-environment-variables.drv