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mavenSettingsConfigFile('my-maven-settings') {
    content readFileFromWorkspace('resources/my_maven_settings.xml')
}

mavenJob('Develop_PR') {
  ...
  providedSettings('my-maven-settings')
}

Putting these two statements in the same file results in a dependency problem:
ERROR: (Develop_PR.groovy, line 46) Managed Maven settings with name 'my-maven-settings' not found

Workaround: Put config files in separate groovy script and process it first.