these 2 derivations will be built:
  /nix/store/6n26hyhg26y8jggwfmqsndkiwxzcb71y-nixos-test-driver-plpgsql_check.drv
  /nix/store/dpqsy00vb45789cazdhblp9zrjx6zbkp-vm-test-run-plpgsql_check.drv