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:
https://github.com/jeremy-edwards2021/langflow
Docker path:
https://github.com/jeremy-edwards2021/langflow/tree/main/docker
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)