this derivation will be built:
  /nix/store/kl15df0pbvw2mkwvkcy7jrvpsk2nnlm7-nix-shell.drv
building '/nix/store/kl15df0pbvw2mkwvkcy7jrvpsk2nnlm7-nix-shell.drv'
nix-shell> Running phase: buildPhase

upload niks3: ok