WordPress Composer Setup
Run composer install to download and install WordPress to a wp directory. Themes and plugins are installed to the content directory.
Note: This is still under development and may have a few bugs.
Plugins
Plugins should be installed using composer from WordPress Packagist. Custom plugins need to be exempted from from the .gitignore file using the !content/plugins/my-plugin syntax.
Environment
Environment variables should be set and a new config folder created to match. For example, when setting ENV to dev, a config/dev/wp-config.php file should be created. For ENV as testing a config/testing/wp-config.php file would need to be created.
Though perhaps not the safest option, if no ENV is set, the default will be production.
Composer.json
Update WordPress by updating the version listed in composer and running a composer update. Third party libraries such as Twig should also be installed here.