docs(contributing): Add guide for running CI tests locally with tox-lsr

[liangwen12year]

Summary by Sourcery

Add a new section to the contributing guide that explains how to run CI tests locally using tox-lsr with QEMU and provides step-by-step setup instructions

Documentation:

• Document how to enable EPEL and install the QEMU inventory script for local testing
• Provide instructions for installing and configuring tox and tox-lsr
• Explain how to download and use the Linux System Roles config file
• Show example commands for running QEMU-based test environments via tox

[sourcery-ai]

Reviewer's Guide

This PR enhances the contributing guide by appending a comprehensive “Running CI Tests Locally” section that shows how to use tox-lsr with QEMU, detailing prerequisites, installation steps, configuration, and example commands.

File-Level Changes

Change	Details	Files
Add guide for running CI tests locally with tox-lsr and QEMU	Insert “Running CI Tests Locally” section into contributing.md List steps to enable EPEL repository on RHEL/CentOS Explain how to install standard-test-roles-inventory-qemu (or fallback script) Describe installation of tox and tox-lsr via package manager or pip Provide download step for linux-system-roles config and an example tox command	playbooks/templates/contributing.md

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[sourcery-ai]

Hey @liangwen12year - I've reviewed your changes and they look great!

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