DD: RSS feed (#23346)

<!--Delete sections as needed -->

## Description

<!-- Tell us what you did and why -->

## Related issues or tickets

<!-- Related issues, pull requests, or Jira tickets -->

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

content/manuals/desktop/release-notes.md

@@ -15,7 +15,10 @@ aliases:
 - /desktop/linux/release-notes/
 - /mackit/release-notes/
 weight: 220
+outputs: ["HTML", "markdown", "RSS"]
+type: "desktop-release"
 ---
+{{< rss-button feed="/desktop/release-notes/index.xml" text="Subscribe to Docker Desktop RSS feed" >}}
 
 <!-- vale off -->
 

layouts/desktop-release/single.rss.xml

@@ -0,0 +1,20 @@
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+  <channel>
+    <title>Docker Docs - Docker Desktop Releases</title>
+    <link>{{ .Permalink }}</link>
+    <description>Docker Desktop release announcements</description>
+    <generator>Hugo -- gohugo.io</generator>
+    <language>{{ .Site.LanguageCode | default "en" }}</language>
+    <lastBuildDate>{{ now.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>
+    <atom:link href="{{ .Permalink }}index.xml" rel="self" type="application/rss+xml" />
+
+    <!-- Single item with the page content -->
+    <item>
+      <title>Latest Docker Desktop Release - {{ now.Format "January 2, 2006" }}</title>
+      <link>{{ .Permalink }}</link>
+      <pubDate>{{ now.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</pubDate>
+      <guid>{{ .Permalink }}#{{ now.Unix }}</guid>
+      <description>{{ .Plain | html }}</description>
+    </item>
+  </channel>
+</rss>