DB_URL=jdbc:postgresql://<host>:<port>/<database>
DB_USERNAME=<database_username>
DB_PASSWORD=<database_password>
JWT_SECRET=<base64_hs256_secret_at_least_32_bytes>
JWT_EXPIRATION=86400000
AGORA_APP_ID=<agora_app_id>
AGORA_APP_CERTIFICATE=<agora_app_certificate>
FIREBASE_CREDENTIALS_PATH=classpath:firebase/google-services-admin.json
FIREBASE_NOTIFICATIONS_COLLECTION=notifications