these 2 derivations will be built:
  /nix/store/21q92x4kysa3k65jx3gaa2kp47vcipxm-nix-grpc-store-0.2.1.drv
  /nix/store/r97g43q9hpwnsh40lsnayd32qc8x9q1b-nix-grpc-store-exit-stress.drv