these 2 derivations will be built:
  /nix/store/lh4kf9wwd5jprw2n377yx6bsv0kb6jpc-nixos-test-driver-plpgsql_check.drv
  /nix/store/6l2wz79sa89d0rx9rgspkxyzsp9krwxp-vm-test-run-plpgsql_check.drv