these 2 derivations will be built:
  /nix/store/gq622smpn4pwzsvhslwadd0l8invyczm-nix-grpc-store-0.2.3.drv
  /nix/store/nq2j1rs1krpd3lhfk1ppgixps8vrp0n0-nix-grpc-store-exit-stress.drv