seecoder-build-jenkins/config/create-api-token.groovy

#!groovy
import groovy.json.JsonSlurper
import hudson.model.*
import jenkins.model.*
import jenkins.security.*
import jenkins.security.apitoken.*

def parser = new JsonSlurper()
def config = parser.parseText(new File('/var/jenkins_home/config.json').text)

def u = User.get(config.jenkins.username)
def t = u.getProperty(ApiTokenProperty.class)
def token = t.tokenStore.generateNewToken("JENKINS_TOKEN")
u.save()
new File('/var/jenkins_home/JENKINS_TOKEN').withWriter('utf-8') {
  writer -> writer.write token.plainValue
}
println "token is $token.plainValue"