Fix deprecation warnings

app/models/mail_server_log.rb

@@ -21,7 +21,7 @@
 class MailServerLog < ApplicationRecord
   # `serialize` needs to be called before all other ActiveRecord code.
   # See http://stackoverflow.com/a/15610692/387558
-  serialize :delivery_status, DeliveryStatusSerializer
+  serialize :delivery_status, coder: DeliveryStatusSerializer
 
   belongs_to :info_request,
              inverse_of: :mail_server_logs,

config/application.rb

@@ -34,10 +34,6 @@ class Application < Rails::Application
     config.load_defaults 7.0
     config.autoloader = :zeitwerk
 
-    # Enable new framework defaults configurations for later Rails versions
-    # preventing deprecation warnings
-    config.active_storage.replace_on_assign_to_many = true # 7.1
-
     # Disable new framework default has_many_inversing breaks some specs due to
     # an apparent regression in Rails
     config.active_record.has_many_inversing = false # 6.1

config/cable.yml

@@ -0,0 +1,12 @@
+development:
+  adapter: redis
+  url: <%= ENV.fetch("REDIS_URL") { "redis://localhost:6379/1" } %>
+  channel_prefix: alaveteli_development
+
+test:
+  adapter: test
+
+production:
+  adapter: redis
+  url: <%= ENV.fetch("REDIS_URL") { "redis://localhost:6379/1" } %>
+  channel_prefix: alaveteli_production

config/initializers/secret_token.rb

@@ -0,0 +1,2 @@
+secret_key_base = AlaveteliConfiguration.secret_key_base
+Rails.application.credentials.secret_key_base = secret_key_base