Failure to update PR with GitHub workflow

[Bullrich]

Example case: https://github.com/polkadot-fellows/runtimes/actions/runs/7902128978

Error message:

HttpError: refusing to allow a GitHub App to create or update workflow .github/workflows/changelog.yml without workflows permission

Requires investigation.

[Bullrich]

GitHub app has read/write access to workflows:

Theory 1:

The PR that was modified contained a workflow file and is a fork. Technically modifying the fork would consist in also modifying the workflow file inside a different repo.

[Bullrich]

I'm able to reproduce the problem:
https://github.com/paritytech-stg/up-to-date-action/actions/runs/7918343737

[Bullrich]

Created the following discussion to publicly report the problem:

• Error: refusing to allow a GitHub App to create or update workflow #108402