Set up RSS/Atom/JSON feeds for blog

src/blog/feeds/atom.xml.njk

@@ -0,0 +1,47 @@
+---
+permalink: /blog/atom.xml
+eleventyExcludeFromCollections: true
+metadata:
+    title: "Garrett's Blog"
+    description: "Write-ups and musings by Garrett Mills, often technical, sometimes not."
+    language: en
+    base: "https://garrettmills.dev"
+    author:
+        name: "Garrett Mills"
+        email: "shout@garrettmills.dev"
+---
+<?xml version="1.0" encoding="utf-8"?>
+<?xml-stylesheet href="http://localhost:8080/blog/feed.xsl" type="text/xsl"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+    <id>{{ metadata.base }}/#about</id>
+    <title>{{ metadata.title }}</title>
+    <updated>{{ collections.blog | getNewestCollectionItemDate | dateToRfc3339 }}</updated>
+    <author>
+        <name>{{ metadata.author.name }}</name>
+        <email>{{ metadata.author.email }}</email>
+        <uri>{{ metadata.base }}/#about</uri>
+    </author>
+    <link rel="alternate" href="{{ metadata.base }}/blog"/>
+    <link rel="self" href="{{ metadata.base }}/blog/atom.xml"/>
+    <subtitle>{{ metadata.description }}</subtitle>
+    <logo>{{ metadata.base }}/assets/favicon/apple-touch-icon.png</logo>
+    <icon>{{ metadata.base }}/assets/favicon/favicon.ico</icon>
+    <rights>Copyright (c) 2025 Garrett Mills. See website for licensing details.</rights>
+    <category term="Technology"/>
+    <category term="Software Development"/>
+    {%- for post in collections.blog %}
+        {%- set absolutePostUrl = post.url | htmlBaseUrl(metadata.base) %}
+        <entry>
+            <title type="html"><![CDATA[{{ post.data.title }}]]></title>
+            <id>{{ absolutePostUrl }}</id>
+            <link href="{{ absolutePostUrl }}"/>
+            <updated>{{ post.date | dateToRfc3339 }}</updated>
+            <author>
+                <name>{{ metadata.author.name }}</name>
+                <email>{{ metadata.author.email }}</email>
+                <uri>{{ metadata.base }}/#about</uri>
+            </author>
+            <content type="html">{{ post.content | renderTransforms(post.data.page, metadata.base) }}</content>
+        </entry>
+    {%- endfor %}
+</feed>