Refactor conditions for preview release triggers

[UnschooledGamer]

Clarifies PR workflow execution and approval process,
adds allow-unsafe-pr-checkout to nightly-build checkouts when running from PR context.

Formats conditions for preview release triggers.

[greptile-apps]

Greptile Summary

The PR refines preview-release trigger conditions and explicitly permits PR-head checkout in the reusable nightly build.

• Handles bypass-label checks through the pull request’s label collection during synchronize events.
• Restricts the standard preview label check to labeled events.
• Documents the approval requirement before executing PR code.
• Enables allow-unsafe-pr-checkout when the nightly workflow runs in PR context.

Confidence Score: 5/5

The PR appears safe to merge.

The previously reported synchronize-event label lookup is corrected by checking the pull request’s labels, and no blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/on-demand-preview-releases-PR.yml	Refactors event-specific label conditions and correctly checks the bypass label from the pull request payload on synchronize events.
.github/workflows/nightly-build.yml	Documents PR-code approval expectations and enables explicitly approved PR-head checkout for PR builds.

_{Reviews (3): Last reviewed commit: "Update .github/workflows/on-demand-previ..." | Re-trigger Greptile}