Render CI status on merge requests index page

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

CHANGELOG

@@ -11,6 +11,7 @@ v 8.2.0 (unreleased)
   - Show "Empty Repository Page" for repository without branches (Artem V. Navrotskiy)
   - Fix: Inability to reply to code comments in the MR view, if the MR comes from a fork
   - Use git follow flag for commits page when retrieve history for file or directory
+  - Show merge request CI status on merge requests index page
 
 v 8.1.0
   - Ensure MySQL CI limits DB migrations occur after the fields have been created (Stan Hu)

app/models/merge_request.rb

@@ -470,4 +470,10 @@ class MergeRequest < ActiveRecord::Base
       unlock_mr if locked?
     end
   end
+
+  def ci_commit
+    if last_commit
+      source_project.ci_commit(last_commit.id)
+    end
+  end
 end

app/views/projects/merge_requests/_merge_request.html.haml

+- ci_commit = merge_request.ci_commit
 %li{ class: mr_css_classes(merge_request) }
   .merge-request-title
     %span.merge-request-title-text
@@ -6,6 +7,9 @@
       - merge_request.labels.each do |label|
         = link_to_label(label, project: merge_request.project)
     .pull-right.light
+      - if ci_commit
+        = link_to ci_status_path(ci_commit), class: "c#{ci_status_color(ci_commit)}" do
+          = ci_status_icon(ci_commit)
       - if merge_request.merged?
         %span
           %i.fa.fa-check

app/views/projects/merge_requests/widget/_heading.html.haml

-- ci_commit = @merge_request.source_project.ci_commit(@merge_request.source_sha)
+- ci_commit = @merge_request.ci_commit
 - if ci_commit
   - status = ci_commit.status
   .mr-widget-heading