Feature request: generate openapi docs to a file

[amitlevy21]

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Example Code

I wish for something like:

fastapi openapi [path].{json,yaml}

Description

Hi,
I'm aware that you can programmatically generate the openapi.json like seen here fastapi/fastapi#1173 and the docs: https://fastapi.tiangolo.com/how-to/extending-openapi

But I wish the cli would provider something easier to use, this would help greatly in CI/CD systems that use bash scripts only and would facilitate integration with openapi tools that work with files like seen in https://openapi.tools

Operating System

Linux, macOS

Operating System Details

Irrelevant

Python Version

3.12.5

Additional Context

Thank you!