these 2 derivations will be built:
  /nix/store/8nsxpisn0jh6cx9h32nkq7h3i5r5bfhv-nixos-test-driver-pg_tle.drv
  /nix/store/bpfxfjygrb2li3mw9125ijv15hlpyzvq-vm-test-run-pg_tle.drv