add tags to rss feed

src/layouts/Layout.astro

@@ -31,7 +31,7 @@ const title = Astro.props.title || Astro.props.frontmatter?.title || 'Unknown';
 			rel="alternate"
 			type="application/rss+xml"
 			title="ghall.blog - RSS"
-			href="/rss.xml"
+			href={`${Astro.site}rss.xml`}
 		/>
 		<title>{`ghall.blog - ${title}`}</title>
 	</head>

src/pages/rss.xml.js

@@ -18,6 +18,7 @@ export async function get(context) {
 				title: post.data.title,
 				pubDate: post.data.pubDate,
 				link: `/posts/${post.slug}`,
+				categories: post.data.tags,
 				content: sanitizeHtml(parser.render(post.body)),
 			})),
 	});