these 2 derivations will be built:
  /nix/store/vkxqbar44zzz01qqbz64jqy4wmrlrmzj-nix-grpc-store-0.1.0-beta.1.drv
  /nix/store/aflpkjkr1mxmq5l7nb31rrb127bc5pjv-nix-grpc-store-dispatcher.drv