this derivation will be built:
  /nix/store/8qhx0f135sdd3s81wnyvx8gahkr7chkp-bcachefs-module-7.0.0-28-generic.drv
building '/nix/store/8qhx0f135sdd3s81wnyvx8gahkr7chkp-bcachefs-module-7.0.0-28-generic.drv'...