fix: respect the outdir option in the netlify integration (#13799)

Co-authored-by: Emanuele Stoppa <my.burning@gmail.com>

Author: Lofty-Brambles

.changeset/fine-needles-send.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/netlify': patch
+---
+
+Fixes an issue where the adapter didn't take into consideration the `outDir` configuration.

packages/integrations/netlify/src/index.ts

@@ -515,7 +515,7 @@ export default function netlifyIntegration(
 				rootDir = config.root;
 				await cleanFunctions();
 
-				outDir = new URL('./dist/', rootDir);
+				outDir = new URL(config.outDir, rootDir);
 
 				const enableImageCDN = isRunningInNetlify && (integrationConfig?.imageCDN ?? true);