Fix autoloading deprecation warnings from Rails 6 (#16010)

config/initializers/content_security_policy.rb

@@ -51,6 +51,7 @@ Rails.application.config.content_security_policy_nonce_generator = -> request {
 
 Rails.application.config.content_security_policy_nonce_directives = %w(style-src)
 
+Rails.application.reloader.to_prepare do
   PgHero::HomeController.content_security_policy do |p|
     p.script_src :self, :unsafe_inline, assets_host
     p.style_src  :self, :unsafe_inline, assets_host
@@ -59,3 +60,4 @@ end
   PgHero::HomeController.after_action do
     request.content_security_policy_nonce_generator = nil
   end
+end

config/initializers/paperclip.rb

@@ -112,7 +112,9 @@ else
   )
 end
 
+Rails.application.reloader.to_prepare do
   Paperclip.options[:content_type_mappings] = { csv: Import::FILE_TYPES }
+end
 
 # In some places in the code, we rescue this exception, but we don't always
 # load the S3 library, so it may be an undefined constant:

config/initializers/suppress_csrf_warnings.rb

@@ -1,3 +1,5 @@
 # frozen_string_literal: true
 
+Rails.application.reloader.to_prepare do
   ActionController::Base.log_warning_on_csrf_failure = false
+end