these 2 derivations will be built:
  /nix/store/vw5ibxsajr0igx03iifaiafafmi6k9mw-nixos-test-driver-plpgsql_check.drv
  /nix/store/5jck875y6aj86vn450vss2x61cvzsk3g-vm-test-run-plpgsql_check.drv