## Summary
- Add a separate workflow (`flakiness-upload.yml`) that uploads
Playwright flakiness reports to flakiness.io for pull requests from
forks
- Fork PRs don't have access to secrets during CI, so this uses
`workflow_run` to upload results after CI completes (workflow_run has
access to secrets from the base repo)
- Update `ci.yml` to upload `flakiness-report` artifacts for each shard

## Test plan
- [ ] Verify CI workflow creates flakiness-report artifacts for each
shard
- [ ] Verify flakiness-upload workflow triggers after CI completes for
fork PRs
- [ ] Verify reports are uploaded to flakiness.io successfully

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Co-authored-by: Will Chen <willchen90@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>