fix(platform-redirect): Fixes the 500 error on /platform-redirect (#14273)

Fixes #14244

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Co-authored-by: getsantry[bot] <66042841+getsantry[bot]@users.noreply.github.com>

Author: BYK

src/mdx.ts

@@ -60,7 +60,9 @@ const root = process.cwd();
 const FILE_CONCURRENCY_LIMIT = 200;
 const CACHE_COMPRESS_LEVEL = 4;
 const CACHE_DIR = path.join(root, '.next', 'cache', 'mdx-bundler');
-mkdirSync(CACHE_DIR, {recursive: true});
+if (process.env.CI) {
+  mkdirSync(CACHE_DIR, {recursive: true});
+}
 
 const md5 = (data: BinaryLike) => createHash('md5').update(data).digest('hex');