these 2 derivations will be built:
  /nix/store/5vbyhvgi0kz03dzm0gvj358j1knz3khr-nix-grpc-store-0.2.1.drv
  /nix/store/h163yh0gw4jnd36lljjfkqkxrgq1l4kv-nix-grpc-store-exit-stress.drv