There are lines in your app/config/config.yml :
imports: - { resource: parameters.yml } - { resource: security.yml }
Just add your file there.
imports: ... - { resource: your_custom_file.yml }
Your user file must be in the app/config directory. If you want to include a file from the Bundle, you can import it as follows:
imports: ... - { resource: "@YourBundle/Resources/config/your_custom_file.yml" }
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