Composer-enabled Drupal template

This is Pantheon's recommended starting point for forking new Drupal upstreams
that work with the Platform's Integrated Composer build process. It is also the
Platform's standard Drupal 9 upstream.

Unlike with earlier Pantheon upstreams, files such as Drupal Core that you are
unlikely to adjust while building sites are not in the main branch of the
repository. Instead, they are referenced as dependencies that are installed by
Composer.

For more information and detailed installation guides, please visit the
Integrated Composer Pantheon documentation: https://pantheon.io/docs/integrated-composer

Contributing

Contributions are welcome in the form of GitHub pull requests. However, the
pantheon-upstreams/drupal-composer-managed repository is a mirror that does not
directly accept pull requests.

Instead, to propose a change, please fork pantheon-systems/drupal-composer-managed
and submit a PR to that repository.