these 2 derivations will be built:
  /nix/store/8jahll7irjcvqfpq9a8r0k3756hxzn0g-nixos-test-driver-pg_tle.drv
  /nix/store/3bzp2cs7mr0vl0gzn1cm3ifd1a3rqni1-vm-test-run-pg_tle.drv