these 2 derivations will be built:
  /nix/store/c63m9jl709b5sr1zfcm9j2zcvvc2ls4h-nixos-test-driver-pgmq-drop-queue-overload.drv
  /nix/store/v654aa7vl95ykwfja8hc96nhwinnlzvj-vm-test-run-pgmq-drop-queue-overload.drv