docs: add automation & workflows section to README

[dhiller]

Summary

• Document the GitHub Actions workflows and Prow postsubmit that automate data collection and report generation
• This pipeline documentation was previously only available in the AGENTS.md file used by AI assistants

🤖 Assisted by Claude

Summary by CodeRabbit

• Documentation
  • Added an “Automation & Workflows” section describing CI-health data collection and report generation.
  • Documented workflow schedules, triggers, outputs, and generated CI failure reports.
  • Clarified the central results artifact and how updates are published.

[kubevirt-prow]

Skipping CI for Draft Pull Request.
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📥 Commits

Reviewing files that changed from the base of the PR and between 7d83aa4 and 7727156.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Changes

CI automation documentation

Layer / File(s)	Summary
Automation and workflow documentation README.md	Documents the results.json pipeline, GitHub Actions workflow triggers and purposes, and Prow publication of per-SIG HTML failure reports.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: kubevirt-bot

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and accurately describes the README documentation update about automation and workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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[brianmcarey]

/lgtm

[dollierp]

/approve

[kubevirt-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dollierp

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