Config provider files cannot be created with a constant ID via the Job DSL. This is a problem as the Config provider Pipeline step only accepts ID's as a reference, which are dynamically generated by the Job DSL.

    configFileProvider(
        [configFile(fileId: 'maven-settings', variable: 'MAVEN_SETTINGS')]) {
        sh 'mvn -s $MAVEN_SETTINGS clean package'
    }

The Job DSL should allow specifying a custom/static ID when creating a new Config provider file (just as we can when creating Config provider files through the UI)