CI: Run workflow each night

[amotl]

Just maintenance.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

A nightly scheduled trigger (4 AM UTC) and concurrency group key have been added to the GitHub Actions test workflow configuration to enable scheduled test runs and manage concurrent workflow executions.

Changes

Cohort / File(s)	Summary
Workflow Configuration .github/workflows/tests.yml	Added nightly cron schedule (0 4 * * *) and concurrency group key (${{ github.workflow }}-${{ github.ref }}) to orchestrate scheduled test runs and prevent concurrent executions on the same ref.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~7 minutes

Poem

🐰 Tests now run when moonlight gleams,
At four o'clock, the pipeline dreams,
With concurrency groups keeping workflows sane,
No race conditions cause us pain! ✨

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci-nightly

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