Adds Build column to environments list

app/assets/stylesheets/pages/environments.scss

@@ -26,6 +26,7 @@
     }
   }
 
+  .build-link,
   .branch-name {
     color: $gl-dark-link-color;
   }

app/views/projects/environments/_environment.html.haml

@@ -10,6 +10,11 @@
       = user_avatar(user: last_deployment.user, size: 20)
 
   %td
+    - if last_deployment && last_deployment.deployable
+      = link_to [@project.namespace.becomes(Namespace), @project, last_deployment.deployable], class: 'build-link' do
+        = "#{last_deployment.deployable.name} (##{last_deployment.deployable.id})"
+
+  %td
     - if last_deployment
       = render 'projects/deployments/commit', deployment: last_deployment
     - else

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

@@ -27,6 +27,7 @@
         %tbody
           %th Environment
           %th Last Deployment
+          %th Build
           %th Commit
           %th
           %th