Store avatars as binary instead of base64

app/models/user.rb

@@ -159,6 +159,15 @@ class User < ApplicationRecord
     @display_name ||= ldap_entry[:display_name]
   end
 
+  def avatar
+    @avatar ||= LdapManager::FetchAvatar.call(cn: cn)
+  end
+
+  def avatar_base64
+    return nil if avatar.nil?
+    @avatar_base64 ||= Base64.strict_encode64(avatar)
+  end
+
   def nostr_pubkey
     @nostr_pubkey ||= ldap_entry[:nostr_key]
   end
@@ -186,10 +195,6 @@ class User < ApplicationRecord
     ZBase32.encode(Digest::SHA1.digest(cn))
   end
 
-  def avatar
-    @avatar_base64 ||= LdapManager::FetchAvatar.call(cn: cn)
-  end
-
   def services_enabled
     ldap_entry[:services_enabled] || []
   end