these 2 derivations will be built:
  /nix/store/wq738k910ksqavrz4xvifywjca3mh7cp-nix-grpc-store-0.2.2.drv
  /nix/store/aalrnk83v1b39pqfxgspkr3yw0vlxmj8-nix-grpc-store-exit-stress.drv