these 2 derivations will be built:
  /nix/store/y5n03x08kl0sawdnw9d41dzsg1lfp5am-nix-grpc-store-0.2.0.drv
  /nix/store/n3nv56ga2li43bgpk6scd1cviiqc1nr5-nix-grpc-store-dispatcher.drv