chore: remove --prefer-dist from composer install to allow fallback to git source

Dockerfile

@@ -5,11 +5,11 @@ WORKDIR /app
 COPY composer.json composer.lock ./
 
 # --no-scripts: artisan belum ada di stage ini, post-autoload-dump dijalankan di stage final
+# tanpa --prefer-dist agar Composer bisa fallback ke git source saat unduhan dist gagal (mis. GitHub 504)
 RUN composer install \
     --no-dev \
     --no-interaction \
     --no-progress \
-    --prefer-dist \
     --no-scripts \
     --no-autoloader