these 2 derivations will be built:
  /nix/store/nd8faffkzlyr6nq4z7vps50gphr5ffjk-nix-grpc-store-0.2.2.drv
  /nix/store/52vgj0amiazh25vwisksm8i3jbr1z9bx-nix-grpc-store-dispatcher.drv