these 2 derivations will be built:
  /nix/store/3vjq2xd445l096l87gra80g0bqjglmak-nixos-test-driver-pg_tle.drv
  /nix/store/z3j8ivd6zbbdsqp4bz34amqxpjjp47af-vm-test-run-pg_tle.drv