these 2 derivations will be built:
  /nix/store/wlrgsfclq3pbhv0wd260w4qzbh14x5az-nix-grpc-store-0.2.3.drv
  /nix/store/w20p06dyplp4xhlgsfnrgnf8mgqjbr3n-nix-grpc-store-exit-stress.drv