Add warning about Pages initial deployment delay

This commit adds a warning message that is always displayed that informs
users that their GitLab Pages sites will take a bit of time before they
can be accessed after being deployed for the first time.

app/views/projects/pages/_access.html.haml

@@ -5,9 +5,11 @@
     .card-body
       %p
         %strong
-          Congratulations! Your pages are served under:
+          = _("Your pages are served under:")
       %p= link_to @project.pages_url, @project.pages_url
       - @project.pages_domains.each do |domain|
         %p= link_to domain.url, domain.url
+    .card-footer.alert-primary
+      = _("It may take up to 30 minutes before the site is available after the first deployment.")

changelogs/unreleased/65304-add-pages-first-deployment-message.yml

+---
+title: Add warning about initial deployment delay for GitLab Pages sites
+merge_request: 32122
+author:
+type: added

locale/gitlab.pot

@@ -6257,6 +6257,9 @@ msgstr ""
 msgid "Issues, merge requests, pushes, and comments."
 msgstr ""
+msgid "It may take up to 30 minutes before the site is available after the first deployment."
+msgstr ""
+
 msgid "It must have a header row and at least two columns: the first column is the issue title and the second column is the issue description. The separator is automatically detected."
 msgstr ""
@@ -13608,6 +13611,9 @@ msgstr ""
 msgid "Your new personal access token has been created."
 msgstr ""
+msgid "Your pages are served under:"
+msgstr ""
+
 msgid "Your password reset token has expired."
 msgstr ""

spec/features/projects/pages_spec.rb

@@ -30,6 +30,12 @@ shared_examples 'pages settings editing' do
         expect(page).to have_content('Access pages')
       end
+      it 'renders first deployment warning' do
+        visit project_pages_path(project)
+
+        expect(page).to have_content('It may take up to 30 minutes before the site is available after the first deployment.')
+      end
+
       context 'when support for external domains is disabled' do
         it 'renders message that support is disabled' do
           visit project_pages_path(project)