Merge branch 'russell/edit-pages-dns-to-use-alias' into 'master'

Use ALIAS instead of CNAME

See merge request gitlab-org/gitlab!75589

app/views/projects/pages_domains/_dns.html.haml

 - verification_enabled = Gitlab::CurrentSettings.pages_domain_verification_enabled?
-- dns_record = "#{domain_presenter.domain} CNAME #{domain_presenter.project.pages_subdomain}.#{Settings.pages.host}."
+- dns_record = "#{domain_presenter.domain} ALIAS #{domain_presenter.project.pages_subdomain}.#{Settings.pages.host}."
 
 .form-group.border-section
   .row

spec/features/projects/pages/user_adds_domain_spec.rb

@@ -177,11 +177,11 @@ RSpec.describe 'User adds pages domain', :js do
         expect(domain.key).to be_nil
       end
 
-      it 'shows the DNS CNAME record' do
+      it 'shows the DNS ALIAS record' do
         visit project_pages_path(project)
 
         within('#content-body') { click_link 'Edit' }
-        expect(page).to have_field :domain_dns, with: "#{domain.domain} CNAME #{domain.project.pages_subdomain}.#{Settings.pages.host}."
+        expect(page).to have_field :domain_dns, with: "#{domain.domain} ALIAS #{domain.project.pages_subdomain}.#{Settings.pages.host}."
       end
     end
   end