these 2 derivations will be built:
  /nix/store/2l26vgm8mxmmm3w2953xvzp5r02a806g-nix-grpc-store-0.2.0.drv
  /nix/store/9s7ynjrxiissr5bcx0fryjfqn6ra6yva-nix-grpc-store-exit-stress.drv