Add tag delete button

app/views/projects/tags/_tag.html.haml

@@ -17,6 +17,11 @@
       - if can?(current_user, :push_code, @project)
         = link_to edit_namespace_project_tag_release_path(@project.namespace, @project, tag.name), class: 'btn-grouped btn has_tooltip', title: "Edit release notes" do
           = icon("pencil")
+
+      - if can?(current_user, :admin_project, @project)
+        = link_to namespace_project_tag_path(@project.namespace, @project, tag.name), class: 'btn btn-grouped btn-xs btn-remove remove-row has_tooltip', title: "Delete tag", method: :delete, data: { confirm: "Deleting the '#{tag.name}' tag cannot be undone. Are you sure?", container: 'body' }, remote: true do
+          = icon("trash-o")
+
   - if commit
     = render 'projects/branches/commit', commit: commit, project: @project
   - else