Update Instance Actor when updating instance settings

Also fix an issue when publishing activities to followers/group members

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon/config.ex

@@ -231,6 +231,7 @@ defmodule Mobilizon.Config do
 
   def anonymous_actor_id, do: get_cached_value(:anonymous_actor_id)
   def relay_actor_id, do: get_cached_value(:relay_actor_id)
+  def admin_settings, do: get_cached_value(:admin_config)
 
   @spec get(module | atom) :: any
   def get(key), do: get(key, nil)
@@ -300,6 +301,24 @@ defmodule Mobilizon.Config do
     end
   end
 
+  @spec create_cache(atom()) :: map()
+  defp create_cache(:admin_config) do
+    %{
+      instance_description: instance_description(),
+      instance_long_description: instance_long_description(),
+      instance_name: instance_name(),
+      registrations_open: instance_registrations_open?(),
+      contact: contact(),
+      instance_terms: instance_terms(),
+      instance_terms_type: instance_terms_type(),
+      instance_terms_url: instance_terms_url(),
+      instance_privacy_policy: instance_privacy(),
+      instance_privacy_policy_type: instance_privacy_type(),
+      instance_privacy_policy_url: instance_privacy_url(),
+      instance_rules: instance_rules()
+    }
+  end
+
   def clear_config_cache do
     Cachex.clear(:config)
   end