these 2 derivations will be built:
  /nix/store/f86w1vw66yxxdwf67fl2pldsik4cb3l3-nixos-test-driver-plpgsql_check.drv
  /nix/store/h5c7awmkfz09z0sp52mqwg69p6i1hjkd-vm-test-run-plpgsql_check.drv