these 2 derivations will be built:
  /nix/store/18whvj18racqg0mr8nc2nab82k4n6l89-nixos-test-driver-pg_stat_monitor.drv
  /nix/store/zw8nga1gdq8whwr58d57qfwp45z2xw56-vm-test-run-pg_stat_monitor.drv