Detect build setup state based on gitlab_ci.yml presense

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/repository.rb

@@ -467,6 +467,10 @@ class Repository
     end
   end
 
+  def gitlab_ci_yml
+    @gitlab_ci_yml ||= blob_at(head_commit.sha, '.gitlab-ci.yml') unless empty?
+  end
+
   def head_commit
     @head_commit ||= commit(self.root_ref)
   end

app/views/projects/_builds_settings.html.haml

@@ -2,7 +2,7 @@
   %legend
     Builds:
 
-  - unless @project.builds.any?
+  - unless @repository.gitlab_ci_yml
     .form-group
       .col-sm-offset-2.col-sm-10
         %p Before you can use Builds (Continuous Integration) feature you need to setup it.

app/views/projects/builds/index.html.haml

@@ -27,7 +27,7 @@
         = link_to 'Cancel running', cancel_all_namespace_project_builds_path(@project.namespace, @project),
           data: { confirm: 'Are you sure?' }, class: 'btn btn-danger', method: :post
 
-      - unless @project.builds.any?
+      - unless @repository.gitlab_ci_yml
         = link_to 'Get started with Builds', help_page_path('ci/quick_start', 'README'), class: 'btn btn-info'
 
       = link_to ci_lint_path, class: 'btn btn-default' do