Max file size limit not configurable

[urucchi]

Describe the bug
Configurable max upload file size was supposedly added in #507 but I don't see any configurable env vars in the CONFIGURATION doc or in env.ts. I have tried setting FILE_SIZE_LIMIT = 20971520 (20mb) in docker compose but I still get the 5mb error upon uploading a larger file.

To Reproduce
Steps to reproduce the behavior:

1. Set FILE_SIZE_LIMIT to a number of bytes larger than 5mb
2. Create an expense and try to upload a file larger than 5mb
3. An error will pop up saying the file must be smaller than 5mb.

Expected behavior
FILE_SIZE_LIMIT should be configurable as a docker env

App version
2.0.0
Smartphone (please complete the following information):

• Device: Samsung Galaxy s25
• OS: Android 16
• Browser: Firefox
• Version