feat: add RSS feed endpoint with sorted posts and metadata

src/pages/rss.xml.ts

@@ -0,0 +1,24 @@
+import rss from '@astrojs/rss';
+import { getCollection } from 'astro:content';
+import type { APIContext } from 'astro';
+
+export async function GET(context: APIContext) {
+  const posts = await getCollection('posts');
+  const base = import.meta.env.BASE_URL;
+
+  const sortedPosts = posts.sort(
+    (a, b) => b.data.date.getTime() - a.data.date.getTime()
+  );
+
+  return rss({
+    title: 'Crash Test Dev',
+    description: 'Technical publishing by Ken Chau',
+    site: context.site!,
+    items: sortedPosts.map((post) => ({
+      title: post.data.title,
+      pubDate: post.data.date,
+      description: post.data.summary ?? '',
+      link: `${base}posts/${post.id}/`,
+    })),
+  });
+}