DSK config split

Adds suiting default config for config_split and drunomics/drush-phapp-env-mode.

Usage

• Install and enable the module - on all environments.

• Add development modules as needed to your site's config_split.config_split.development.yml:

  module: default_content: 0 devel: 0

• Put environment-mode specific config into config/env/development or config/env/production.