Use existing config access to `local_domain` value (#30509)

app/views/auth/registrations/edit.html.haml

@@ -3,7 +3,7 @@
 
 - if self_destruct?
   .flash-message.warning
-    = t('auth.status.self_destruct', domain: ENV.fetch('LOCAL_DOMAIN'))
+    = t('auth.status.self_destruct', domain: Rails.configuration.x.local_domain)
 - else
   = render partial: 'status', locals: { user: @user, strikes: @strikes }
 

app/views/errors/self_destruct.html.haml

@@ -3,7 +3,7 @@
 
 .simple_form
   %h1.title= t('self_destruct.title')
-  %p.lead= t('self_destruct.lead_html', domain: ENV.fetch('LOCAL_DOMAIN'))
+  %p.lead= t('self_destruct.lead_html', domain: Rails.configuration.x.local_domain)
 
 .form-footer
   %ul.no-list

spec/requests/well_known/oauth_metadata_spec.rb

@@ -6,7 +6,7 @@ describe 'The /.well-known/oauth-authorization-server request' do
   let(:protocol) { ENV.fetch('LOCAL_HTTPS', true) ? :https : :http }
 
   before do
-    host! ENV.fetch('LOCAL_DOMAIN')
+    host! Rails.configuration.x.local_domain
   end
 
   it 'returns http success with valid JSON response' do

spec/support/signed_request_helpers.rb

@@ -6,7 +6,7 @@ module SignedRequestHelpers
 
     headers ||= {}
     headers['Date'] = Time.now.utc.httpdate
-    headers['Host'] = ENV.fetch('LOCAL_DOMAIN')
+    headers['Host'] = Rails.configuration.x.local_domain
     signed_headers = headers.merge('(request-target)' => "get #{path}").slice('(request-target)', 'Host', 'Date')
 
     key_id = ActivityPub::TagManager.instance.key_uri_for(sign_with)

spec/system/profile_spec.rb

@@ -7,7 +7,7 @@ describe 'Profile' do
 
   subject { page }
 
-  let(:local_domain) { ENV['LOCAL_DOMAIN'] }
+  let(:local_domain) { Rails.configuration.x.local_domain }
 
   before do
     as_a_logged_in_user