these 2 derivations will be built:
  /nix/store/6k4pc58naxyvcj0s7950jajnjmy8s3mi-nixos-test-driver-plpgsql_check.drv
  /nix/store/rb71bfmx8gz2d0jc5pdjj8jdwhfdfpil-vm-test-run-plpgsql_check.drv