[Upstream] Review xai-org/grok-build changes

[github-actions]

A newer state of xai-org/grok-build is available for review.

• Last reviewed commit: d71f6e0c
• Current upstream commit: 19d42e35c07a9c9244f03f6df0c4c353f970d4f9
• Last reviewed upstream version: 1.0.5
• Current upstream version: 1.0.6
• Last reviewed release: none
• Current upstream release: none

Review and port relevant changes according to the upstream sync procedure. Do not merge upstream wholesale or update .github/upstream.json before the selected changes pass the Chutes Build quality gates.