Add Copilot guidelines and setup workflow for WP Rocket

[Miraeld]

Description

Won't impact users.
Setup the guidelines for CoPilot

Type of change

• Chore

Detailed scenario

What was tested

None

How to test

None

Technical description

Documentation

This pull request introduces a set of guidelines for contributing to the WP Rocket plugin and a new GitHub Actions workflow for automated setup and testing. These changes aim to standardize development practices and streamline the CI/CD process.

Contribution Guidelines

• Added a new COPILOT_GUIDELINES.md file outlining coding standards, project architecture, testing practices, and development workflows for WP Rocket. This includes PHP coding standards, JavaScript and CSS guidelines, and instructions for writing tests and fixtures.

CI/CD Workflow

• Introduced a copilot-setup-steps.yml GitHub Actions workflow to automate the setup and testing of WP Rocket. This workflow installs PHP, Composer, Node.js, and project dependencies, and runs PHPCS, PHPStan, and PHPUnit tests on pushes and pull requests to main and test/* branches.

New dependencies

None

Risks

None

Mandatory Checklist

Unticked items justification

Not relevant because it's only markdown files.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -0.10%)	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (ad2d1a0)	39802	17566	44.13%
Head commit (500c69a)	39805 (+3)	17568 (+2)	44.14% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#7483)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[Copilot]

Pull Request Overview

Adds a new set of GitHub Copilot–specific contribution guidelines and a CI workflow to automate environment setup and code validation for the WP Rocket plugin.

• Introduce COPILOT_GUIDELINES.md with coding standards, architecture patterns, testing practices, and development workflows.
• Add copilot-setup-steps.yml GitHub Actions workflow to install PHP/Composer/Node, run PHPCS, PHPStan, and PHPUnit on push and PR.

Reviewed Changes

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

File	Description
.github/COPILOT_GUIDELINES.md	New markdown outlining coding conventions, project structure, TDD, CI
.github/workflows/copilot-setup-steps.yml	New GitHub Actions workflow for automated setup and testing