these 2 derivations will be built:
  /nix/store/hr2qapg4gv3l28rw0slm23d368qc1nm1-nix-grpc-store-0.2.1.drv
  /nix/store/g0421gi9rsqdrazx8khs0jr5pgbmiy6g-nix-grpc-store-exit-stress.drv