these 2 derivations will be built:
  /nix/store/k9gbb3nc1smvw02il1v00cg8iqaxng01-nixos-test-driver-pgmq.drv
  /nix/store/1wdjfhvyci6dnhlz3z0gvfd37ly8jrv2-vm-test-run-pgmq.drv