ci: Skip reviews for PRs with [citest_skip] in the title

[spetrosi]

• Add info about .coderabbit.yam for AI assistants to contributing.md
• Note that CodeRabbit uses config from the main branch so this change will apply
  after this PR is merged.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR establishes comprehensive repository coding standards and AI assistant guidance for the certificate role. It introduces a complete CodeRabbit configuration file specifying review automation settings, pre-merge checks for Conventional Commits and PR structure, and detailed path-specific coding standards covering Ansible files, Python, and documentation. The contributing guide is updated to reference these standards, and the ansible.posix collection dependency version is specified.

Changes

Coding Standards and Repository Configuration

Layer / File(s)	Summary
CodeRabbit configuration foundation .coderabbit.yaml	Establishes CodeRabbit YAML metadata, chat output settings, review automation toggles (disabling fun features, in-progress tracking, and auto-apply behaviors), and pre-merge checks enforcing Conventional Commit titles and PR description structure.
Ansible-specific coding standards .coderabbit.yaml	Defines comprehensive path instructions for Ansible task files (parameterized no_log patterns, module conventions, idempotency, check-mode support, test coverage), handlers (no_log requirements), test playbooks (strict role invocation pattern), templates (header requirements), and variable definitions (defaults/ vs vars/ naming and documentation conventions).
Python and documentation standards .coderabbit.yaml	Adds path instructions for Python files (PEP 8/Black formatting via tox) and documentation (README updates required for new user-facing variables with usage examples).
Contributing guide and collection dependency contributing.md, meta/collection-requirements.yml	Updates contributing guide to direct contributors and AI assistants to .coderabbit.yaml for coding standards; adds ansible.posix collection version requirement (>=2.1.0,<2.2.0).

🚥 Pre-merge checks | ✅ 4 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description Format	⚠️ Warning	PR description lacks required template sections. Missing: "Enhancement:" or "Feature:", "Reason:", and "Result:" sections specified in .github/pull_request_template.md.	Rewrite PR description following template: Add "Enhancement:", "Reason:", "Result:" sections with content describing what changed, why, and the impact.
Description check	⚠️ Warning	The PR description is incomplete, missing required template sections (Enhancement, Reason, Result, Issue Tracker Tickets) and only provides bullet points about changes.	Restructure the description to follow the template with Enhancement (what changed), Reason (why), Result (expected outcome), and Issue Tracker Tickets sections.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The PR title follows Conventional Commits format with 'ci' type and clear description about skipping reviews for PRs with [citest_skip].

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}