Link builds list status to build details

app/views/projects/commit_statuses/_commit_status.html.haml

 %tr.commit_status
   %td.status
+    - if commit_status.target_url
+      = link_to commit_status.target_url, class: "ci-status ci-#{commit_status.status}" do
+        = ci_icon_for_status(commit_status.status)
+        = commit_status.status
+    - else
       = ci_status_with_icon(commit_status.status)
 
   %td.commit_status-link