This package provides a series of scripts to be used to manage upstreams in Pantheon.
Install it as usual with composer:
composer require pantheon-systems/upstream-management
It will prompt you to authorize the plugin, please do so.
This plugin provides two commands to be used by custom upstreams:
Use it to require dependencies in your upstream-configuration folder.
composer upstream-require drupal/ctools
Use it to use version locked dependencies in your upstream (and to update those versions). This way you can pin the versions for your upstream dependencies.
composer upstream:update-dependencies