ci: Add config file for CodeRabbit with custom rules

[spetrosi]

Sourcery that we currently use cannot read documentation files and best
practices, it's rather a refactoring tool.
So I want to introduce CodeRabbit that allows creating .coderabbit.yaml with
custom rules and conventions.

Signed-off-by: Sergei Petrosian spetrosi@redhat.com

Summary by Sourcery

Introduce a CodeRabbit configuration file to standardize automated code review behavior and enforce project-specific contribution conventions.

CI:

• Configure CodeRabbit review settings, disabling nonessential features and enabling pre-merge checks for PR titles and descriptions.

Documentation:

• Encode project contribution guidelines and Ansible role conventions into automated review instructions for tasks, handlers, tests, templates, variables, Python code, and README usage documentation.

[sourcery-ai]

Reviewer's Guide

Adds a new CodeRabbit configuration file to standardize automated code review behavior and enforce linux-system-roles conventions, PR metadata requirements, and path-specific review instructions for Ansible, tests, templates, variables, Python, and docs.

File-Level Changes

Change	Details	Files
Introduce CodeRabbit configuration with review behavior, metadata checks, and disabled non-essential features.	Configure global chat and review behavior, disabling fun and auto features such as poems, fortunes, automatic labels/assignees, and additional analysis features. Disable finishing touches like unit-test suggestions and limit CodeRabbit to core review functionality.	.coderabbit.yaml
Enforce PR title and description structure via pre-merge checks.	Add a warning-mode check that validates PR titles follow Conventional Commits syntax and allowed types from .commitlintrc.js. Add a custom warning-mode check that validates PR descriptions follow the project’s pull request template sections (Enhancement/Feature, Reason, Result, optional Issue Tracker Tickets).	.coderabbit.yaml
Define path-specific review instructions reflecting linux-system-roles best practices for Ansible tasks, handlers, tests, templates, variables, Python code, and docs.	Add detailed Ansible tasks guidance covering no_log usage, OSTree-compatible package installation, third-party collections avoidance, role referencing, idempotency, check-mode support, and required test coverage for new tasks. Add instructions for handlers to apply tlog_secure_logging to sensitive data, and for tests to use the central include_tasks wrapper and ensure idempotent, assert-based verification. Require specific headers for Jinja2 templates, prefixes and locations for defaults/ and vars/ variables, Python style checks via Black/flake8, and README documentation for all new user-facing variables.	.coderabbit.yaml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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