[Feature] Define allowlist in files

[knqyf263]

Hi team. Thank you for the great project.

It would be great if allowlist can be defined in files since we need to support corporate-level contributors. A company manages a file containing user names in the company and we want to assume they've signed our CLA. Moreover, it is better to specify a directory where there are allowlist files because we don't want to add a file name every time a new company signs.

Thanks

[ibakshay]

Hi @knqyf263,
First of all, I am really sorry for a late response.
I find this feature very useful. Feel free to create a pull request. If not, I will work on it in the coming weeks :)