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

Chores:

• Introduce .coderabbit.yaml with centralized review rules aligned with linux-system-roles contributor conventions.

[sourcery-ai]

Reviewer's Guide

Adds a centralized CodeRabbit configuration file (.coderabbit.yaml) to enforce linux-system-roles contribution conventions and customize automated review behavior for this repository, including PR metadata checks and path-specific review instructions for Ansible tasks, tests, templates, variables, Python, and documentation.

Flow diagram for CodeRabbit PR review with .coderabbit.yaml

flowchart TD
    Developer[Developer opens PR] --> GitHub[GitHub PR]
    GitHub --> CodeRabbit[CodeRabbit review bot]

    CodeRabbit --> Config[Load .coderabbit.yaml]

    Config --> PreMergeChecks[Apply pre_merge_checks]
    PreMergeChecks --> TitleCheck[Validate PR title format]
    PreMergeChecks --> DescriptionCheck[Check description template]

    Config --> PathInstructions[Apply path_instructions]
    PathInstructions --> AnsibleTasks[tasks/**/*.yml rules]
    PathInstructions --> Tests[tests/tests_*.yml rules]
    PathInstructions --> Templates[templates/**/*.j2 rules]
    PathInstructions --> Defaults[defaults/**/*.yml rules]
    PathInstructions --> Vars[vars/**/*.yml rules]
    PathInstructions --> Python[**/*.py rules]
    PathInstructions --> Docs[README.md rules]

    CodeRabbit --> ReviewOutput[Post review comments with warnings]
    ReviewOutput --> Developer

Loading

File-Level Changes

Change	Details	Files
Introduce repository-wide CodeRabbit configuration to align automated reviews with linux-system-roles standards and disable non-essential features.	Create .coderabbit.yaml with project-level chat and review behavior settings, turning off fun and auto-features such as poems, fortunes, auto labels, and auto reviewer assignment. Configure pre-merge checks to validate PR titles against Conventional Commits rules and encourage structured PR descriptions following the shared template. Define path-specific instructions for Ansible tasks, handlers, tests, templates, defaults/vars, Python files, and README.md to guide CodeRabbit’s feedback in line with existing best practices (security, OSTree compatibility, idempotency, test coverage, and documentation).	.coderabbit.yaml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Several instructions are hard-coded to the example "template" role (e.g., template_ / __template_ prefixes, system_role:template fingerprint, template_secure_logging, __template_packages, __template_is_ostree), which may not align with other linux-system-roles; consider parameterizing or generalizing this config so it applies correctly across different roles.
• The rules reference specific files and paths like .commitlintrc.js, .github/pull_request_template.md, vars/main.yml, defaults/main.yml, tasks/run_role_with_clear_facts.yml, and tests/tests_*.yml; please double-check that these exist or are consistently named in all repositories where this centralized .coderabbit.yaml will be used to avoid false warnings.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Several instructions are hard-coded to the example "template" role (e.g., `template_` / `__template_` prefixes, `system_role:template` fingerprint, `template_secure_logging`, `__template_packages`, `__template_is_ostree`), which may not align with other linux-system-roles; consider parameterizing or generalizing this config so it applies correctly across different roles.
- The rules reference specific files and paths like `.commitlintrc.js`, `.github/pull_request_template.md`, `vars/main.yml`, `defaults/main.yml`, `tasks/run_role_with_clear_facts.yml`, and `tests/tests_*.yml`; please double-check that these exist or are consistently named in all repositories where this centralized `.coderabbit.yaml` will be used to avoid false warnings.

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