[webui] Add Kiwi Image breadcrumb

To make easy to navigate in the kiwi images pages. Speacially important now
that we plan to introduce kiwi images packages.

src/api/app/helpers/webui/kiwi/image_helper.rb

@@ -0,0 +1,12 @@
+module Webui::Kiwi::ImageHelper
+  include Webui::ProjectHelper
+
+  def kiwi_image_breadcrumb(kiwi_image, *args)
+    @project = kiwi_image.package.try(:project)
+    return unless @project
+
+    args.insert(0, link_to_if(params['action'] != 'show', 'Image',
+                              kiwi_image_path(id: kiwi_image)))
+    project_bread_crumb( *args )
+  end
+end

src/api/app/views/webui/kiwi/_tabs.html.erb

@@ -6,6 +6,8 @@
   });
 <% end %>
 
+<% kiwi_image_breadcrumb(@image, @image.name) %>
+
 <div class="box-header header-tabs" id="package_tabs">
   <ul>
     <%= tab 'kiwi', 'Kiwi', controller: 'kiwi/images', action: 'show', selected: true %>