these 2 derivations will be built:
  /nix/store/hl2iyk1c1np14nvml18g5b3fh1yf246l-nixos-test-driver-pgmq.drv
  /nix/store/4jzkw2lqchwslxkici6nbl4fwi2hhr8x-vm-test-run-pgmq.drv