GHES not supported

[marcorosa]

This action is currently working only if the repositories are on GitHub.com, i.e., it does not support GitHub enterprise servers.

I think this is due to the GitHub api endpoints hardcoded in scripts/builders.py and scripts/main.py.
If this is really where the issue is coming from (to be verified), the GitHub api endpoint may be set using the workflow variable GITHUB_API_URL.