app/views/templates/releases.rss.twig

<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
   <channel>
      <title>{{ title }}</title>
      <description>{{ description }}</description>
      <link>{{ site_link }}</link>
      <language>en-US</language>
      <lastBuildDate>{{ latest_release_date }}</lastBuildDate>
      <ttl>1440</ttl>
      <atom:link href="https://whattrainisitnow.com/rss/" rel="self" type="application/rss+xml" />
{% for release in releases %}
      <item>
         <title>Firefox {{ release.version }}</title>
         <description>Firefox release {{ release.version }} shipped on {{ release.date|format_date(pattern='MMMM d, YYYY') }}
{%- if release.platform == 'android' -%}&lt;br&gt;This is an Android-only release{% endif %}
{%- if release.platform == 'desktop' -%}&lt;br&gt;This is a desktop-only release{% endif %}</description>
{% if release.platform == 'android' %}
         <link>https://www.mozilla.org/en-US/firefox/android/{{ release.version }}/releasenotes/</link>
         <guid>https://www.mozilla.org/en-US/firefox/android/{{ release.version }}/releasenotes/</guid>
{% else %}
         <link>https://www.mozilla.org/en-US/firefox/{{ release.version }}/releasenotes/</link>
         <guid>https://www.mozilla.org/en-US/firefox/{{ release.version }}/releasenotes/</guid>
{% endif %}
         <pubDate>{{ release.date }}</pubDate>
      </item>
{% endfor %}
   </channel>
</rss>