these 2 derivations will be built:
  /nix/store/f4nwcma656123lrdpgx6fjfgpxlr5h7c-nix-grpc-store-0.2.2.drv
  /nix/store/8m28fv15ykgqa2lfwd5bdrv32d8z0prh-nix-grpc-store-exit-stress.drv