create_pr_update: Use intermediary env variable to avoid unexpected side effects #5
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I was auditing for any "run" stanzas that accepted external inputs and found an unlikely-to-be-exploited case in 'create_pr_update'. This variable is not generally controlled by anyone except for repo owners, but I figured I should send a PR in any way.
Context: https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable