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

CI:

• Configure CodeRabbit reviews with custom rules for PR titles, descriptions, and file-type-specific review guidelines.

[sourcery-ai]

Reviewer's Guide

Adds a new .coderabbit.yaml configuration file to integrate CodeRabbit code review automation with this repository, encoding project-specific review rules, conventions, and path-based instructions for Ansible roles, tests, templates, variables, Python code, and documentation.

File-Level Changes

Change	Details	Files
Introduce CodeRabbit configuration with global review behavior and PR metadata checks.	Configure global chat and reviews options, disabling cosmetic and automatic features such as poems, fortunes, auto-assignment, auto-labeling, and finishing touches unit-test prompts. Define pre-merge checks that enforce Conventional Commit-style PR titles in warning mode. Add a custom pre-merge description check requiring a structured PR template with Enhancement/Feature, Reason, Result, and optional Issue Tracker sections.	.coderabbit.yaml
Define path-specific CodeRabbit review instructions for Ansible tasks, handlers, tests, templates, variables, Python code, and README documentation.	Add detailed rules for Ansible tasks regarding no_log usage, OSTree-compatible package installation, third-party collections, idempotency, check mode, and mandatory test coverage for new tasks. Specify handler rules for logging sensitive data, and strict test playbook invocation patterns using include_tasks wrappers with quality/idempotency expectations. Enforce template headers, variable naming and file placement conventions for defaults/ and vars/, Python style requirements (PEP 8, Black, tox checks), and README requirements for documenting new user-facing variables and examples.	.coderabbit.yaml

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[sourcery-ai]

Hey - I've left some high level feedback:

• The .coderabbit.yaml embeds quite a lot of detailed, role-specific guidance (e.g., around timesync variables and test patterns); consider replacing some of the longer normative sections with links or short references to the canonical contributor docs to reduce the risk of them drifting out of sync.
• Several instructions talk about enforcing test and documentation requirements (e.g., in tasks/**/*.yml and defaults/**/*.yml), which may be better expressed as warnings or suggestions in the wording so that CodeRabbit feedback doesn’t conflict with existing review policies when exceptions are needed.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `.coderabbit.yaml` embeds quite a lot of detailed, role-specific guidance (e.g., around timesync variables and test patterns); consider replacing some of the longer normative sections with links or short references to the canonical contributor docs to reduce the risk of them drifting out of sync.
- Several instructions talk about enforcing test and documentation requirements (e.g., in `tasks/**/*.yml` and `defaults/**/*.yml`), which may be better expressed as warnings or suggestions in the wording so that CodeRabbit feedback doesn’t conflict with existing review policies when exceptions are needed.

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