these 2 derivations will be built:
  /nix/store/3gra8g01gdbn5qda1x3djfa5frn5a95d-nixos-test-driver-plpgsql_check.drv
  /nix/store/qlf8dbw2g9c7qknqbdhdpv4ww8pvz4fh-vm-test-run-plpgsql_check.drv