Audit GitHub Actions, fix issues, and add zizmor job

[xmudrii]

• Address issues reported by Scorecard and zizmor
• Add zizmor job to ensure compliance

Relevant to platform-mesh/backlog#334

[github-advanced-security]

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[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-07-13 17:46 UTC