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

Add CodeRabbit configuration to standardize automated PR review behavior and enforce project conventions.

CI:

• Configure CodeRabbit review bot with disabled nonessential features and custom pre-merge checks for PR titles and descriptions based on project conventions.

Documentation:

• Document expectations for tasks, handlers, tests, templates, variables, Python code, and README updates within the CodeRabbit configuration to guide future contributions.

Chores:

• Introduce centrally managed .coderabbit.yaml synced from the shared linux-system-roles GitHub configuration repository.

[sourcery-ai]

Reviewer's Guide

Adds a .coderabbit.yaml configuration file to integrate CodeRabbit code review automation with this repository, defining disabled features, PR title/description conventions, and detailed path-based review instructions aligned with linux-system-roles guidelines.

Sequence diagram for CodeRabbit PR review with .coderabbit.yaml

sequenceDiagram
  actor Developer
  participant GitHub
  participant CodeRabbit
  participant coderabbit_yaml

  Developer->>GitHub: Open_pull_request
  GitHub->>CodeRabbit: Trigger_review
  CodeRabbit->>coderabbit_yaml: Load_configuration
  CodeRabbit->>CodeRabbit: Apply_reviews_settings
  CodeRabbit->>CodeRabbit: Run_pre_merge_checks_title
  CodeRabbit->>CodeRabbit: Run_pre_merge_checks_custom_checks
  CodeRabbit->>CodeRabbit: Apply_path_instructions
  CodeRabbit->>GitHub: Post_review_comments_and_warnings
  GitHub->>Developer: Display_CodeRabbit_feedback

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File-Level Changes

Change	Details	Files
Introduce repository-wide CodeRabbit configuration and review rules	Add .coderabbit.yaml with base metadata and note that it is centrally managed from linux-system-roles/.github Configure chat and review options to disable non-essential and auto/"fun" features, including automatic labels, reviewer assignment, and auxiliary summaries Define pre-merge checks enforcing Conventional Commits format for PR titles and a structured PR description template with Feature/Enhancement, Reason, Result, and optional Issue Tracker sections Add path-specific instructions for Ansible tasks, handlers, tests, templates, defaults, vars, Python code, and README to guide CodeRabbit’s review behavior based on linux-system-roles best practices Encode conventions for no_log usage, OSTree-compatible package installation, idempotency, check-mode support, test coverage expectations, variable naming and placement, PEP8/Black formatting, and documentation requirements	.coderabbit.yaml

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[sourcery-ai]

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

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