these 2 derivations will be built:
  /nix/store/6hyqcjf2w2y4kig5izy7wbmczcj34ss4-nixos-test-driver-pg_tle.drv
  /nix/store/irzhir8rvrz1pdxmycni159hswvx3kf8-vm-test-run-pg_tle.drv