these 2 derivations will be built:
  /nix/store/rbbgndcdzm01g8p2jg4619ahjim7x9ry-nix-grpc-store-0.1.0.drv
  /nix/store/0swdfs0rzp4wbb10r3ixhngy5javfcd0-nix-grpc-store-exit-stress.drv