.well-known folder?

Hey folks,

I need to upload a file to the .well-known folder to verify an integration, but I’m not entirely sure where to put it, as we are on Magento Cloud with read-only environments. The pub directory is read-only, so I can’t make a .well-known folder in there. Am I going to have to do some custom routing?

It needs to be accessible with this url structure:

https://example.com/.well-known/filename