Adds per-tag RSS link to each tag page.

src/components/BaseHead.astro

@@ -13,6 +13,13 @@ interface Props {
 
 const canonicalURL = new URL(Astro.url.pathname, Astro.site);
 
+const blogTagMatch = Astro.url.pathname.match(/blog\/tag\/(\w+)/);
+
+const rssUrl =
+  blogTagMatch
+    ? new URL(`blog/tag/${blogTagMatch[1]}.rss.xml`, Astro.site)
+    : new URL(`rss.xml`, Astro.site);
+
 const { title, description, image } = Astro.props;
 ---
 
@@ -25,7 +32,7 @@ const { title, description, image } = Astro.props;
 	rel="alternate"
 	type="application/rss+xml"
 	title={SITE_TITLE}
-	href={new URL('rss.xml', Astro.site)}
+	href={rssUrl}
 />
 <meta name="generator" content={Astro.generator} />
 

src/layouts/BlogList.astro

@@ -14,6 +14,7 @@ const { selectedTag } = Astro.props;
 const tags = await getAllTags();
 
 const posts = await getPublishedPosts( selectedTag );
+
 ---
 
 <RootLayout>