Add zizmor workflow

[jaydeluca]

No description provided.

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[Copilot]

Pull request overview

Adds a new GitHub Actions workflow to run Zizmor for GitHub Actions security analysis on pushes to main, pull requests, and manual dispatch.

Changes:

• Introduces .github/workflows/zizmor.yml to run the zizmorcore/zizmor-action.
• Configures the workflow/job permissions intended for security scanning uploads (security-events: write).

Comments suppressed due to low confidence (1)

.github/workflows/zizmor.yml:16

• The job-level permissions only includes security-events: write. Add contents: read here as well (or move it to the workflow-level permissions) so the checkout step has the minimal permissions it needs.

    permissions:
      security-events: write

[trask]

What does this do?

[jaydeluca]

Copied it from the .NET repo, but it makes the fetch more efficient and only downloads objects/trees as needed.

reference comment

Docs say:

Partial clone allows us to avoid downloading such unneeded objects in advance during clone and fetch operations and thereby reduce download times and disk usage. Missing objects can later be "demand fetched" if/when needed.