ci: add zizmor scanning

[ryzrr]

Summary
Adds a zizmor workflow to scan Github Actions for security issues

What kind of change does this PR introduce?
CI -Tooling

Did you add tests for your changes?
No

Does this PR introduce a breaking change?
No

If relevant, what needs to be documented once your changes are merged or what have you already documented?
NA

Use of AI
No

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Project	Deployment	Actions	Updated (UTC)
webpack-doc-kit	Ready	Preview, Comment	Jun 26, 2026 3:17pm

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