these 2 derivations will be built:
  /nix/store/dfb0kqcwg5r2x8kg1npl9s6jw07md77n-nixos-test-driver-plpgsql_check.drv
  /nix/store/cdw29b3z1vbwzidn06nxzxs7dyzwa3k4-vm-test-run-plpgsql_check.drv