chore(preview-server): remove detach from build script (#2917)

Co-authored-by: gabriel miranda <[email protected]>

Author: gabrielmfern

packages/preview-server/scripts/build-preview-server.mts

@@ -3,7 +3,6 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 const nextBuildProcess = spawn('pnpm next build', {
-  detached: true,
   shell: true,
   stdio: 'inherit',
   cwd: path.resolve(import.meta.dirname, '../'),