Include WHATSAPP_ env vars in container .env generation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/entrypoint.sh

@@ -17,7 +17,7 @@ chmod -R 775 storage bootstrap/cache
 
 # Build .env from Docker env vars (CapRover passes them as container env)
 : > .env
-env | grep -E "^(APP_|DB_|LOG_|SESSION_|CACHE_|QUEUE_|FILESYSTEM_|BROADCAST_|MAIL_|TRUSTED_|BCRYPT_|PLATFORM_|ADMIN_|ACADEMY_|RUN_)" | sort | sed 's/=\(.*\)/="\1"/' >> .env
+env | grep -E "^(APP_|DB_|LOG_|SESSION_|CACHE_|QUEUE_|FILESYSTEM_|BROADCAST_|MAIL_|TRUSTED_|BCRYPT_|PLATFORM_|ADMIN_|ACADEMY_|RUN_|WHATSAPP_)" | sort | sed 's/=\(.*\)/="\1"/' >> .env
 
 # Ensure APP_KEY line exists (key:generate needs it to write to)
 if ! grep -q '^APP_KEY=' .env 2>/dev/null; then