title: Using Shopware "Add to shopping cart" button in plugin
body: <p>I'm writing a custom plugin for Shopware 5.
  How do I display the "Add to shopping cart" button on a page for an arbitrary article?</p>
  
  <p>Currently I'm fetching some existing articles directly from the database. I then assign these articles to a custom frontend tpl file (which extends a default tpl file). Now I want the button to be displayed for one of these fetched articles.</p>
  
  <p>I found the smarty block that holds the button (<code>frontend_detail_buy_button</code> in <code>themes/Frontend/Bare/frontend/detail/buy.tpl</code>), but I don't know how to extend/change it to my needs.</p>
  
  <p>My Shopware version is 5.2.8.</p>