Use object url instead of a hack

[akkoma] / lib / pleroma / web / metadata / provider.ex

# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Metadata.Providers.Provider do
  @callback build_tags(map()) :: list()
end