these 2 derivations will be built:
  /nix/store/dpqzx5xsys9fcxqp3sba3069rrpihxrm-nixos-test-driver-plpgsql_check.drv
  /nix/store/fcranqvds3a5028p8fy5pnafky0v201x-vm-test-run-plpgsql_check.drv