Potential fix for code scanning alert no. 9: Workflow does not contain permissions

[DeveloperTryingToCodeLikeOtherOfThem]

Potential fix for https://github.com/DeveloperTryingToCodeLikeOtherOfThem/pxt-hardware-programming-docs/security/code-scanning/9

In general, the fix is to define a permissions block in the workflow (either at the top level or per job) that grants only the permissions actually required. This job needs to check out code and push commits back to the repo, so it requires contents: write. It does not appear to interact with issues, pull requests, or other resources, so no additional scopes are necessary.

The single best minimal fix without changing functionality is to add a permissions section to the update-index job in .github/workflows/update-docs-index.yml, directly under runs-on: ubuntu-latest. This will scope the GITHUB_TOKEN for this job to contents: write only. No imports or additional methods are required, since this is purely a YAML configuration change.

Concretely:

• Edit .github/workflows/update-docs-index.yml.
• Under jobs: update-index: runs-on: ubuntu-latest, insert:

    permissions:
      contents: write

• Leave the rest of the steps unchanged so the workflow behavior remains the same while the token is now explicitly and minimally scoped.

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[gemini-code-assist]

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