these 2 derivations will be built:
  /nix/store/3mz2s2vwsql8n6figaclck1yyg3gis08-nixos-test-driver-pgmq-drop-queue-overload.drv
  /nix/store/d4i94skyb3ddivlvlrgdks8hj3h7hpn4-vm-test-run-pgmq-drop-queue-overload.drv