Langflow Docker deployment crashes on Railway (PORT + filesystem permissions)

Question

I’m attempting to deploy **Langflow** on Railway using a Dockerfile from my GitHub repository, but the service crashes at runtime with **filesystem permission** and **port parsing** errors. **Repo:** **Docker path:** **Dockerfile:** `/docker/render.Dockerfile` **Errors seen in deploy logs:** ``` Invalid value for '--port': '$PORT' is not a valid integer PermissionError: [Errno 13] Permission denied: '/app/data/.cache' ``` Langflow attempts to write to `/app/data/.cache/langflow`, which appears non-writable in Railway’s runtime. **Start command:** ``` langflow run --host 0.0.0.0 --port 7860 ``` Could you advise the **Railway-compatible fix** (Dockerfile, writable path, volume, or PORT handling)