Update app.py

app.py

@@ -17,7 +17,7 @@ from loguru import logger
 st.set_page_config(page_title="Talk2Book", page_icon="📖")
 
 # ns = SimpleNamespace(counter=0)
-os.environ["OPENAI_API_KEY"] == st.secrets["OPENAI_API_KEY"]
+os.environ["OPENAI_API_KEY"] = st.secrets["OPENAI_API_KEY"]
 open_api_key = os.getenv('OPENAI_API_KEY', '')
 logger.debug(f" open_api_key: [{open_api_key}]")