these 2 derivations will be built:
  /nix/store/mh8id505ynh7y653sz18glf3b8z2jrf7-nixos-test-driver-plpgsql_check.drv
  /nix/store/iqnm14skg9kz47qz6284n1kwbywvi035-vm-test-run-plpgsql_check.drv