Pass head_ref as env var

[ryangraphite]

Pass head_ref as env var instead of in line.

[ryangraphite]

• Pass head_ref as env var #15 👈 (View in Graphite)
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[cursor]

PR Summary

Low Risk
Low risk workflow change limited to how github.head_ref is passed into latest_artifact.sh; main risk is mis-resolution of the head ref causing the action to miss prior SHA artifacts.

Overview
Simplifies the Download SHAs from last run step by exporting github.head_ref as HEAD_REF in env: and using "$HEAD_REF" when invoking latest_artifact.sh, instead of interpolating github.head_ref inline.

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[ryangraphite]

Merge activity

• Mar 9, 6:42 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Mar 9, 6:42 PM UTC: @ryangraphite merged this pull request with Graphite.