these 2 derivations will be built:
  /nix/store/qcj0irrnyxlyi5ci85jj9pdgqs13028f-nix-grpc-store-0.2.1.drv
  /nix/store/6zifb5v2jw5nxd44kdkirymcq4slkp19-nix-grpc-store-exit-stress.drv