these 2 derivations will be built:
  /nix/store/xpqq1cx1wlsgwx245q378c5qmd5qvprp-nix-grpc-store-0.1.0.drv
  /nix/store/rf8dw2l3gm04fr809a8yp4klxpncyk1x-nix-grpc-store-exit-stress.drv