Accessibility scanner action flags GitHub's own /pages/auth infrastructure page (Actions)

When running the scanner action on a private GitHub Pages site, the scanner flags an axe _page-has-heading-one_ violation on the URL `/pages/auth`. This page is GitHub's own built-in authentication page (the login gate for private GitHub Pages sites), not a page a user can author or control.

The scanned element contains attributes like `data-turbo-loaded`, `data-color-mode`, `data-a11y-animated-images`, and `js-focus-visible`, which confirm it is GitHub's own UI, not user content. We cannot fix this violation because we do not own the page.

In our case, this triggered 30 duplicate pull requests in our repository (as we ran on a list of URLs), all attempting to create a pages/auth.html file that has no effect on the actual scanned page.

Request:

Please either
- (1) fix the accessibility violation on GitHub's own /pages/auth page, or
- (2) update the github/accessibility-scanner action to exclude GitHub-infrastructure URLs from its scan scope by default, or
- document how to configure URL exclusions for these pages

The private repo with CoPilot's attempts to fix the issue:
https://github.com/mcdonalds-corp-new/ally/pull/84

URL of the workflow run:
https://github.com/mcdonalds-corp-new/ally/actions/runs/24263521708/job/70852992850

Error message:
Set issue Accessibility issue: Heading levels should only increase by one on /pages/auth (mcdonalds-corp-new/ally#25) state to closed Set issue Accessibility issue: Page should contain a level-one heading on /pages/auth (mcdonalds-corp-new/ally#26) state to closed

Workflow file and workflow run log attached.

[gh-a11y-scanner.yml](https://github.com/user-attachments/files/27214881/gh-a11y-scanner.yml)

[logs_64167249977.zip](https://github.com/user-attachments/files/27214893/logs_64167249977.zip)

Start with the attached gh-a11y-scanner.yml and the workflow logs to trace how /pages/auth is discovered, scanned, and reported. Check the scanner's URL-scope or exclusion configuration and reproduce the false positive if possible. Done means the GitHub infrastructure page is handled without user-created fixes, either through scanner behavior or documented configuration.

索引モデルが issue の本文から書いたものです。