this derivation will be built:
  /nix/store/b5xkvx5fkvhb7x2y124h4rdxiw6lh6n9-atomic-test-help.drv
building '/nix/store/b5xkvx5fkvhb7x2y124h4rdxiw6lh6n9-atomic-test-help.drv' on 'grpc://[fddb:4344:343b:14b9:399:9324:19d9:3451]:50051?ca-cert=/run/nix-grpc-store/ca.crt&connect-timeout=5'
building '/nix/store/b5xkvx5fkvhb7x2y124h4rdxiw6lh6n9-atomic-test-help.drv' on [fddb:4344:343b:14b9:399:9324:19d9:3451]:50051
atomic-test-help> stibnite: building b5xkvx5fkvhb7x2y124h4rdxiw6lh6n9-atomic-test-help.drv

upload niks3: ok