these 2 derivations will be built:
  /nix/store/4yh0i98s0j7cab4r0k84qljwj21sdkx0-nixos-test-driver-plpgsql_check.drv
  /nix/store/f85xryg1mwmr0mv88gl4drhyi95413hp-vm-test-run-plpgsql_check.drv