these 2 derivations will be built:
  /nix/store/fr9bv5czg9ahffwfdvn8nmhmf7g4diwp-nixos-test-driver-pg_tle.drv
  /nix/store/liafmbvw1241rr1wkjbkqaw20lvjjwlw-vm-test-run-pg_tle.drv