security(gha): fix potential for shell injection #15483
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Lms24
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Running these workflows is gated pretty well, but this mitigates the potential for a script injection attack by passing the input to an intermediary environment variable first.
See https://docs.github.com/en/actions/security-for-github-actions/security-guides/security-hardening-for-github-actions#example-of-a-script-injection-attack for more details.