fix max_age

Author: zcesur

lib/algora_web/controllers/og_image_controller.ex

@@ -49,7 +49,7 @@ defmodule AlgoraWeb.OGImageController do
       {_, last_modified} ->
         case DateTime.from_iso8601(convert_to_iso8601(last_modified)) do
           {:ok, modified_at, _} ->
-            DateTime.diff(DateTime.utc_now(), modified_at, :second) > @max_age
+            DateTime.diff(DateTime.utc_now(), modified_at, :second) > max_age()
 
           _error ->
             true
@@ -86,7 +86,7 @@ defmodule AlgoraWeb.OGImageController do
             Task.start(fn ->
               Algora.S3.upload(body, object_path,
                 content_type: "image/png",
-                cache_control: "public, max-age=#{@max_age}"
+                cache_control: "public, max-age=#{max_age()}"
               )
 
               File.rm(filepath)