How to use lfs with external storage?

[retzero]

Hello.
I'd like to use our own s3-compatible storage for LFS blobs. It works fine in command line interface.
How to use this actions/checkout action for the same? Example usage is very welcome!

Here is my current .lfsconfig;

[lfs]
   url = "https://{ID}:{TOKEN}@my-external-s3.com"