Update app.py

app.py

@@ -1,6 +1,17 @@
 from fastapi import FastAPI
+from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
+import os
 
 app = FastAPI()
 
-app.mount("/", StaticFiles(directory="/opt/node_app/excalidraw/build"), name="static")
+static_directory = "/opt/node_app/excalidraw/build"
+app.mount("/", StaticFiles(directory=static_directory), name="static")
+
+@app.get("/", response_class=FileResponse)
+async def read_root():
+   return os.path.join(static_directory, "index.html")
+
+if __name__ == "__main__":
+   import uvicorn
+   uvicorn.run(app, host="0.0.0.0", port=3000)