this derivation will be built:
  /nix/store/v8f2n1yzfkn4ckny9gvhafb5577050h2-bcachefs-module-7.0.0-30-generic.drv
building '/nix/store/v8f2n1yzfkn4ckny9gvhafb5577050h2-bcachefs-module-7.0.0-30-generic.drv'...