these 2 derivations will be built:
  /nix/store/76hp5rv6w78fw8vz01cjhdk0nh552h1g-nixos-test-driver-pg_tle.drv
  /nix/store/z0n6irkxab7n0kc0w0ldbcak9i50jlq6-vm-test-run-pg_tle.drv