these 2 derivations will be built:
  /nix/store/kb34zx3gaagl3gxrnrqc5npazprn3jzd-nixos-test-driver-plpgsql_check.drv
  /nix/store/z1h1cvr2b6qib9rbh64ksj4kh7pl4p4p-vm-test-run-plpgsql_check.drv