these 2 derivations will be built:
  /nix/store/fh5qhifwrn11f1n05hrdd424i07z85yx-nix-grpc-store-0.2.1.drv
  /nix/store/d40956y3lq2ccp17a5wxv64d2b7x701s-nix-grpc-store-exit-stress.drv