feat(ci): run quickstart stack test nightly with Slack failure alert

[marythought]

Summary

The quickstart docker-compose stack test (test-stack in docker-compose-test.yml) currently only runs on push/PR to paths under static/quickstart/, tests/, and docs/getting-started/. Upstream breaking changes (e.g. opentdf/platform#3563) can silently break the quickstart for new users with no notification.

Changes

1. Nightly schedule trigger — cron: '17 6 * * *' so the stack test runs daily.
2. Slack notification on failure — posts to #alerts-opentdf, scoped to scheduled runs only (if: failure() && github.event_name == 'schedule').

Prerequisite

A SLACK_WEBHOOK_URL repo secret must be added (Incoming Webhook for #alerts-opentdf). The Slack step is guarded to schedule events, so it never runs on PRs and the secret is not exposed to fork PRs.

Closes #355

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 2b2b6b5 and 0fe0fa2.

📒 Files selected for processing (1)

• .github/workflows/docker-compose-test.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/quickstart-nightly-test

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