these 2 derivations will be built:
  /nix/store/v8k5qxb53rxxw06glm3b5vr6xw0krnp2-nix-grpc-store-0.2.0.drv
  /nix/store/64jslm3p9m4nkz3bcj2qdryg0j2vkgfy-nix-grpc-store-exit-stress.drv