Docker documentation

Choose the guide that matches what you want to do:

• Docker install (Compose) — default docker-compose.yml, ./.env, persisted MySQL/config.php, GHCR pulls, screenshots, production-minded notes.
• Docker development & CI — docker-compose.dev.yml, E2E/Playwright, PHPUnit, web env reference, maintainer GHCR publishes, GitHub Actions.

In-repo AGENTS.md is optimized for Cursor / IDE contributor notes beside the codebase. Detailed install steps: docker/README.md.