Add RSS feed for blog posts

Co-authored-by: garrytrinder <11563347+garrytrinder@users.noreply.github.com>

Author: Copilot

package-lock.json

@@ -10,6 +10,7 @@
     "astro": "astro"
   },
   "dependencies": {
+    "@astrojs/rss": "^4.0.15",
     "@tailwindcss/vite": "^4.1.18",
     "astro": "^5.17.2",
     "tailwindcss": "^4.1.18"

package.json

@@ -21,6 +21,7 @@ const ogImage = image ? new URL(image, Astro.site ?? 'https://devproxy.net').hre
     <meta name="description" content={description} />
     <meta name="generator" content={Astro.generator} />
     <title>{title} | Dev Proxy</title>
+    <link rel="alternate" type="application/rss+xml" title="Dev Proxy Blog" href={`${import.meta.env.BASE_URL}rss.xml`} />
 
     <!-- Open Graph -->
     <meta property="og:type" content="website" />

src/layouts/Layout.astro

@@ -0,0 +1,22 @@
+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('blog')).sort(
+    (a, b) => b.data.date.valueOf() - a.data.date.valueOf()
+  );
+
+  return rss({
+    title: 'Dev Proxy Blog',
+    description: 'Release announcements, how-to guides, and insights from the Dev Proxy team.',
+    site: context.site?.href ?? 'https://devproxy.net',
+    items: posts.map((post) => ({
+      title: post.data.title,
+      description: post.data.description,
+      pubDate: post.data.date,
+      author: post.data.author,
+      link: `${import.meta.env.BASE_URL}blog/${post.id.replace(/\.md$/, '')}/`,
+    })),
+  });
+}