these 2 derivations will be built:
  /nix/store/1s3zm7n05ypbq7y9aq5rrjrv60b94yy3-nix-grpc-store-0.2.2.drv
  /nix/store/0mczahpl7h1y8n2l2j7v36s0msnygswf-nix-grpc-store-dispatcher.drv