add configurable firewall host IP for firewall command generation

docker-compose.yml

@@ -12,4 +12,5 @@ services:
       - WEB_PASSWORD=${WEB_PASSWORD:-admin}
       # Generate a secure key using: python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
       - ENCRYPTION_KEY=${ENCRYPTION_KEY:-CHANGE_ME_TO_A_VALID_FERNET_KEY}
+      - FIREWALL_HOST_IP=${FIREWALL_HOST_IP:-}
     restart: unless-stopped