these 2 derivations will be built:
  /nix/store/7axlm71r3lzpxhk2k9w234h2hi1dqlf3-nix-grpc-store-0.2.2.drv
  /nix/store/cp8f842p9pf8v4xkmnw2jdwkj2f07h6l-nix-grpc-store-exit-stress.drv