Add zizmor configuration

[martincostello]

Add configuration file to disable rules for anonymous definitions and undocumented permissions.

[Copilot]

Pull Request Overview

This PR adds a zizmor configuration file to disable specific security linting rules for GitHub Actions workflows. The configuration disables two rules: anonymous-definition and undocumented-permissions.

• Adds zizmor configuration file with disabled rules
• Disables anonymous-definition rule checking
• Disables undocumented-permissions rule checking

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.59%. Comparing base (61533e5) to head (df0896a).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1023   +/-   ##
=======================================
  Coverage   98.59%   98.59%           
=======================================
  Files          16       16           
  Lines         284      284           
  Branches       37       37           
=======================================
  Hits          280      280           
  Misses          2        2           
  Partials        2        2           

Flag	Coverage Δ
linux	98.59% <ø> (ø)
macos	97.88% <ø> (ø)
windows	98.59% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.