these 2 derivations will be built:
  /nix/store/f57r4ms86v0gha22lzmbghw0lpww0jwk-nixos-test-driver-pg_tle.drv
  /nix/store/zh5safyazxg0b61s9kir887dqvjhcm4m-vm-test-run-pg_tle.drv