PRIVATE KEY - JANGAN TARUH DI public_html.

1. Upload knowledge_private_key.pem ke folder privat, contoh:
   /home/sekaija1/sakinah-secrets/knowledge_private_key.pem
2. Permission: 600.
3. Isi backend/config.php:
   'knowledge_signing_private_key_path' => '/home/sekaija1/sakinah-secrets/knowledge_private_key.pem',
4. Setelah dipasang, hapus salinan ZIP/private key dari folder publik hosting.

Public key pasangannya sudah tertanam pada Mobile V7.0.0. Bila key diganti,
public key pada app/src/main/assets/knowledge_packs/knowledge_public_key.pem juga wajib diganti dan APK dibangun ulang.
