these 2 derivations will be built:
  /nix/store/yyc778da1ajiclblpq1k9rw93wyc07sc-nix-grpc-store-0.2.2.drv
  /nix/store/kgahz23dwwnkf6whqdyh60547n2vpz8c-nix-grpc-store-exit-stress.drv