these 2 derivations will be built:
  /nix/store/66367i4aw59193yj39xy3scz0cv1f5md-nix-grpc-store-0.2.2.drv
  /nix/store/az6l2cni92hixwh0myl1w6pmrpgfc2bw-nix-grpc-store-exit-stress.drv