[docs] Update safe-outputs documentation for expires: false feature

[github-actions]

Documentation Updates - 2026-01-28

This PR updates the safe-outputs documentation based on the feature merged in PR #12311.

Features Documented

• expires: false support for create-issue and create-discussion safe-outputs (from Add support for expires: false to disable expiration in safe-outputs #12311)

Changes Made

• Updated docs/src/content/docs/reference/safe-outputs.md to document the new expires: false option
  • Added information about expires: false in the Auto-Expiration section for create-issue
  • Updated the create-issue configuration example to show that expires can be set to 7 or false
  • Updated the Discussion Creation section to document expires: false support
  • Updated the create-discussion configuration example to show that expires can be set to 3 or false

Merged PRs Referenced

• Add support for expires: false to disable expiration in safe-outputs #12311 - Add support for expires: false to disable expiration in safe-outputs

Summary

The expires field for create-issue and create-discussion safe-outputs now supports:

• Integers (days): expires: 7 auto-closes after 7 days
• Relative formats: expires: 2h, expires: 7d, expires: 2w, expires: 1m, expires: 1y
• New: Boolean false: expires: false explicitly disables auto-expiration

This is particularly useful when a workflow inherits default expiration settings but needs to disable expiration for specific safe-outputs.

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