these 2 derivations will be built:
  /nix/store/znkpw02a2akm3nsqxsc7gzhfd9sjb5im-nix-grpc-store-0.2.0.drv
  /nix/store/z9b48a6jp0ks9dkwrsb5k9pad0z1cxsd-nix-grpc-store-exit-stress.drv