cache headers for emoji and images

lib/pleroma/web/endpoint.ex

@@ -59,6 +59,18 @@ defmodule Pleroma.Web.Endpoint do
   #
   # You should set gzip to true if you are running phoenix.digest
   # when deploying your static files in production.
+  plug(
+    Plug.Static,
+    at: "/",
+    from: :pleroma,
+    only: ["emoji", "images"],
+    gzip: true,
+    cache_control_for_etags: "public, max-age=1209600",
+    headers: %{
+      "cache-control" => "public, max-age=1209600"
+    }
+  )
+
   plug(
     Plug.Static,
     at: "/",