these 2 derivations will be built:
  /nix/store/7mr7lkws5pazpzkc5lxm4a605n7mx2rx-nixos-test-driver-pg_tle.drv
  /nix/store/sqppv1xaa8h9k3wzcvgyfam1v4xk2hzz-vm-test-run-pg_tle.drv