Groovy script for the Jenkins Script Console to GitHub repositories. Will throw exceptions for builds with other trigger types.

gistfile1.groovy

import hudson.model.*
import hudson.triggers.*
  
import com.cloudbees.jenkins.GitHubTrigger
 
for(item in Hudson.instance.items) {
  println item.name
  item.triggers.each{ k,v ->
    ((GitHubTrigger)v).getGitHubRepositories().each{
      println it
    }
  }
  println ''
}