Establish the publication foundation

src/pages/rss.xml.ts

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+import rss from '@astrojs/rss';
+import { getCollection } from 'astro:content';
+import { site } from '../site.config';
+
+export async function GET(context: { site?: URL }) {
+  const [stories, briefings, episodes] = await Promise.all([
+    getCollection('stories', ({ data }) => !data.draft),
+    getCollection('briefings', ({ data }) => !data.draft),
+    getCollection('episodes', ({ data }) => !data.draft),
+  ]);
+
+  const items = [
+    ...stories.map((entry) => ({
+      title: entry.data.title,
+      description: entry.data.description,
+      pubDate: entry.data.published,
+      link: `/stories/${entry.id}`,
+    })),
+    ...briefings.map((entry) => ({
+      title: entry.data.title,
+      description: entry.data.description,
+      pubDate: entry.data.published,
+      link: `/briefing/${entry.id}`,
+    })),
+    ...episodes.map((entry) => ({
+      title: entry.data.title,
+      description: entry.data.description,
+      pubDate: entry.data.published,
+      link: `/podcast/${entry.id}`,
+    })),
+  ].sort((a, b) => b.pubDate.valueOf() - a.pubDate.valueOf());
+
+  return rss({
+    title: `${site.title} ${site.qualifier}`,
+    description: site.description,
+    site: context.site ?? new URL('https://example.com'),
+    items,
+    customData: '<language>en-gb</language>',
+  });
+}