Can't commit changes to GitHub action files

[elegaanz]

Description

When a Typst project is connected to a GitHub repository with GitHub action files, it is not possible to edit these files in Typst: an Internal server error toast is shown when trying to push the changes.

By looking at the logs, this error is sent by GitHub:

One or more branches were not updated:
  - refs/heads/main: refusing to allow an OAuth App to create or update workflow `.github/workflows/build.yml` without `workflow` scope"

I don't think we should add the "workflow" scope to the permissions of the OAuth app. But we should show this specific error message in the toast. Another option would be to make the CI files read-only, with an informative message on why this is so.

Reproduction URL

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OS

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