these 2 derivations will be built:
  /nix/store/hxhwr74kzrkxwgl0a5jyjzvcni7vihg5-nixos-test-driver-pg_tle.drv
  /nix/store/chjfjmx9qqxckpamix2j85pjr2xgvm7j-vm-test-run-pg_tle.drv