app/views/layouts/publish.html.erb

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title><%= @topic.title %> - <%= SiteSetting.title %></title>
    <%= render partial: "layouts/head" %>
    <%= render partial: "common/discourse_publish_stylesheet" %>
    <%= render_google_tag_manager_head_code %>
    <%= render_google_universal_analytics_code %>
    <%= preload_script 'publish' %>
  </head>
  <body class="<%= @body_classes.to_a.join(' ') %>">
    <%= theme_lookup("header") %>
    <%= yield %>
    <%= theme_lookup("footer") %>
  </body>
</html>