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 PR reviews and enforce project-specific conventions.

CI:

• Configure CodeRabbit review settings, disabling nonessential features and enabling checks for PR title and description format.

Documentation:

• Capture contributor conventions and file-specific guidelines for tasks, handlers, tests, templates, variables, Python code, and README documentation in the CodeRabbit config.

[sourcery-ai]

Reviewer's Guide

Adds a project-wide CodeRabbit configuration file to align automated reviews with linux-system-roles conventions and enforce PR formatting standards, while disabling non-essential CodeRabbit features.

File-Level Changes

Change	Details	Files
Introduce CodeRabbit configuration file tailored to linux-system-roles contribution and review conventions.	Add .coderabbit.yaml with global settings for chat and review features, disabling fun and auto features like poems, fortunes, auto labels, and auto reviewer assignment. Configure pre-merge checks to warn on PR titles that do not follow Conventional Commits and descriptions that do not follow the repository’s PR template structure. Define path-specific review instructions for Ansible tasks, handlers, tests, templates, defaults, vars, Python code, and README to encode existing best practices into automated review guidance.	.coderabbit.yaml

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[sourcery-ai]

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

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