[Aikido] AI Fix for Template Injection in GitHub Workflows Action

[aikido-autofix]

This patch mitigates template injection vulnerabilities in GitHub Workflows by replacing direct references with an environment variable.

Aikido used AI to generate this PR.

High confidence: Aikido has a robust set of benchmarks for similar fixes, and they are proven to be effective.

[changeset-bot]

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Latest commit: 181a490

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