these 2 derivations will be built:
  /nix/store/0qx9qcknbnsx0bx64dgx8a4d5ss0y6vk-nixos-test-driver-pgmq.drv
  /nix/store/nsiql4jmglwnmcfwnsfibnxgsp3h6d6l-vm-test-run-pgmq.drv