Add a dedicated connection pool for Rich Media

Sharing this pool with regular Media is problematic as Rich Media will connect to many different
domains and thrash the pool, but regular Media will have predictable connections to the webservers
hosting media for the fediverse servers you peer with.

config/config.exs

@@ -827,6 +827,11 @@
     max_waiting: 20,
     recv_timeout: 15_000
   ],
+  rich_media: [
+    size: 25,
+    max_waiting: 20,
+     recv_timeout: 15_000
+   ],
   upload: [
     size: 25,
     max_waiting: 5,
@@ -847,6 +852,10 @@
     max_connections: 50,
     timeout: 150_000
   ],
+  rich_media: [
+    max_connections: 50,
+    timeout: 150_000
+  ],
   upload: [
     max_connections: 25,
     timeout: 300_000

lib/pleroma/web/rich_media/helpers.ex

@@ -58,7 +58,7 @@ defp check_content_length(headers) do
 
   defp http_options do
     [
-      pool: :media,
+      pool: :rich_media,
       max_body: Config.get([:rich_media, :max_body], 5_000_000)
     ]
   end