🔨 add a local dev environment

[garak]

No description provided.

[Copilot]

Pull request overview

This PR adds a Docker-based local development environment and documents how to use it to build, run, and execute common quality checks for the PHP chess library.

Changes:

• Added “Local development” documentation to the README.
• Introduced a Makefile with helper targets for Docker Compose, Composer, PHPUnit, PHPStan, and PHP-CS-Fixer.
• Added Docker Compose + a PHP CLI Dockerfile for running the project in containers, and excluded Docker assets from export archives.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
README.md	Documents Docker/Make-based local development workflow and common commands.
Makefile	Adds developer targets for build/start/install/test/stan/cs/coverage/etc. via Docker Compose.
docker/Dockerfile	Defines a PHP CLI image with Composer and pcov for running tools inside Docker.
docker-compose.yaml	Defines a php service for running commands against the mounted working tree.
.gitattributes	Excludes Docker-related dev environment files from distribution exports.

Comments suppressed due to low confidence (1)

Makefile:4

• The args = ... variable is currently unused anywhere in this Makefile. If argument forwarding isn’t needed, it should be removed; otherwise, wire it into the relevant targets so it’s clear how callers should pass arguments.

args = `arg="$(filter-out $@,$(MAKECMDGOALS))" && echo $${arg:-${1}}`

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.