these 2 derivations will be built:
  /nix/store/9b45wprpbhnvnszr5bjhjmfrhjswgnka-nix-grpc-store-0.1.0.drv
  /nix/store/a12k891vdwicfmyqyxk6d3japmfwg069-nix-grpc-store-exit-stress.drv