Automates bug triage by tagging issues based on age: `~old bug` for bugs
≥180 days, `~aging bug` for bugs ≥90 days.
Relates to #39155.
## Changes
**New workflow: `.github/workflows/tag-aging-bugs.yml`**
- Runs daily at 8:06 UTC via cron, supports manual dispatch
- Dry run mode (default: false) logs actions without modifying labels
- Two-pass processing:
1. Bugs ≥180 days: adds `~old bug`, removes `~aging bug` if present
2. Bugs ≥90 days without either label: adds `~aging bug`
- Uses github-script with pagination for scalability
- Follows repo patterns (harden-runner, proper permissions)
# Checklist for submitter
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
## Testing
- [x] QA'd all new/changed functionality manually
<!-- START COPILOT CODING AGENT SUFFIX -->
<!-- START COPILOT ORIGINAL PROMPT -->
<details>
<summary>Original prompt</summary>
> Add a GitHub Actions workflow that runs daily at 8:06am UTC, and can
be manually dispatched. In that workflow, retrieve all issues labelled
`bug` created >= 180 days ago that don't include the `~old bug` tag,
then for each bug add the `~old bug` tag and remove `~aging bug` if it
is applied. Then retrieve all issues labelled `bug` created >= 90 days
ago that has neither `~aging bug` nor `~old bug` tags, and add the
`~aging bug` tag. Include a dry run workflow parameter, default off,
that logs rather than setting the label.
</details>
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Co-authored-by: iansltx <472804+iansltx@users.noreply.github.com>
