these 2 derivations will be built:
  /nix/store/kad5y0vaip6a0jdsnwsnbbqyh8shp48k-nixos-test-driver-pgmq-drop-queue-overload.drv
  /nix/store/hfcapzi87ys11n956ny6w076y2ra6f3d-vm-test-run-pgmq-drop-queue-overload.drv