fix(@astrojs/vercel): include astro feature map and adapter features to the static adapter (#8318)

.changeset/beige-walls-grow.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/vercel': patch
+---
+
+Add astro feature map and adapter features to the static adapter. This will remove the warning emitted by Astro.

packages/integrations/vercel/src/static/adapter.ts

@@ -9,7 +9,23 @@ import { getRedirects } from '../lib/redirects.js';
 const PACKAGE_NAME = '@astrojs/vercel/static';
 
 function getAdapter(): AstroAdapter {
-	return { name: PACKAGE_NAME };
+	return {
+		name: PACKAGE_NAME,
+		supportedAstroFeatures: {
+			assets: {
+				supportKind: 'stable',
+				isSquooshCompatible: true,
+				isSharpCompatible: true,
+			},
+			staticOutput: 'stable',
+			serverOutput: 'unsupported',
+			hybridOutput: 'unsupported',
+		},
+		adapterFeatures: {
+			edgeMiddleware: false,
+			functionPerRoute: false,
+		},
+	};
 }
 
 export interface VercelStaticConfig {