add youtube link

Author: Giovanni Toraldo

events/2021-04-virtual-beer-immutable-operating-systems.md

@@ -16,6 +16,8 @@ sarà inviato la mattina del giorno dell'evento agli iscritti alla nostra
 [newsletter](http://eepurl.com/gqRfon) e sul canale
 [Telegram](https://t.me/joinchat/AB-kXVDvi56sg5ENu1edIA).
 
+<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/lOywJXN_1OE" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
 <button onclick="location.href='http://eepurl.com/gqRfon'" type="button">
          Iscriviti alla newsletter per partecipare 📨</button>