these 2 derivations will be built:
  /nix/store/grlpnvyakmf8m96fwafkljmnbr2l7x3i-nix-grpc-store-0.1.0-beta.4.drv
  /nix/store/p2ak2vy9259ias4xv0wnaa642v4axswz-nix-grpc-store-exit-stress.drv