Add button to CI build artifacts browser into build summary

app/models/ci/build.rb

@@ -328,6 +328,13 @@ module Ci
       end
     end
 
+    def artifacts_browse_url
+      if artifacts_file.exists?
+        Gitlab::Application.routes.url_helpers.
+          browse_namespace_project_build_artifacts_path(project.namespace, project, self)
+      end
+    end
+
     def execute_hooks
       build_data = Gitlab::BuildDataBuilder.build(self)
       project.execute_hooks(build_data.dup, :build_hooks)

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

@@ -91,7 +91,12 @@
 
       - if current_user && can?(current_user, :download_build_artifacts, @project) && @build.download_url
         .build-widget.center
-          = link_to "Download artifacts", @build.download_url, class: 'btn btn-sm btn-primary'
+          .panel.panel-default
+            .panel-heading Build artifacts
+            .panel-body
+              .btn-group{ role: :group }
+                = link_to "Download", @build.download_url, class: 'btn btn-sm btn-primary'
+                = link_to "Browse", @build.artifacts_browse_url, class: 'btn btn-sm btn-primary'
 
       .build-widget
         %h4.title