Fix docs smoke error (#5706)

Co-authored-by: bholmesdev <hey@bholmes.dev>

.changeset/mean-knives-smash.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Add preact and sitemap integration to config load external list

.github/workflows/ci.yml

@@ -218,3 +218,5 @@ jobs:
 
       - name: Test
         run: pnpm run test:smoke
+        env:
+          NODE_OPTIONS: "--max-old-space-size=4096"

package.json

@@ -18,7 +18,7 @@
     "format:imports": "organize-imports-cli ./packages/*/tsconfig.json ./packages/*/*/tsconfig.json",
     "test": "turbo run test --output-logs=new-only --concurrency=1 --filter=astro --filter=create-astro --filter=\"@astrojs/*\"",
     "test:match": "cd packages/astro && pnpm run test:match",
-    "test:smoke": "turbo run build --filter=\"@example/*\" --filter=\"astro.build\" --filter=\"docs\" --output-logs=new-only --concurrency=1",
+    "test:smoke": "turbo run build --filter=\"@example/*\" --filter=\"docs\" --output-logs=new-only --concurrency=1",
     "test:check-examples": "node ./scripts/smoke/check.js",
     "test:vite-ci": "turbo run test --filter=astro --output-logs=new-only --no-deps --concurrency=1",
     "test:e2e": "cd packages/astro && pnpm playwright install && pnpm run test:e2e",

packages/astro/src/core/config/vite-load.ts

@@ -26,7 +26,13 @@ async function createViteLoader(root: string, fs: typeof fsType): Promise<ViteLo
 			// NOTE: Vite doesn't externalize linked packages by default. During testing locally,
 			// these dependencies trip up Vite's dev SSR transform. In the future, we should
 			// avoid `vite.createServer` and use `loadConfigFromFile` instead.
-			external: ['@astrojs/tailwind', '@astrojs/mdx', '@astrojs/react'],
+			external: [
+				'@astrojs/tailwind',
+				'@astrojs/mdx',
+				'@astrojs/react',
+				'@astrojs/preact',
+				'@astrojs/sitemap',
+			],
 		},
 		plugins: [loadFallbackPlugin({ fs, root: pathToFileURL(root) })],
 	});