add configurable firewall host IP for firewall command generation

main.py

@@ -15,6 +15,7 @@ from cryptography.fernet import Fernet
 
 WEB_PASSWORD = os.getenv("WEB_PASSWORD", "admin")
 ENCRYPTION_KEY = os.getenv("ENCRYPTION_KEY")
+FIREWALL_HOST_IP = os.getenv("FIREWALL_HOST_IP")
 DB_PATH = "data/instances.db"
 
 if not ENCRYPTION_KEY or ENCRYPTION_KEY == "CHANGE_ME_TO_A_VALID_FERNET_KEY":
@@ -166,6 +167,10 @@ def create_instance(inst: InstanceCreate):
     conn.close()
     return {"status": "ok"}
 
+@app.get("/api/config")
+def get_config():
+    return {"firewall_host_ip": FIREWALL_HOST_IP}
+
 @app.delete("/api/instances/{id}")
 def delete_instance(id: int):
     conn = sqlite3.connect(DB_PATH)