these 2 derivations will be built:
  /nix/store/68g4crfa1iz0ygihzy64b460rf4vi1wx-nix-grpc-store-0.1.0.drv
  /nix/store/iq5xgymwk5cp8j34w6bw028idi59x7hc-nix-grpc-store-exit-stress.drv