Add the Sonar installation

configure_sonarqube.groovy

import jenkins.model.*
import hudson.plugins.sonar.*
import hudson.plugins.sonar.model.*

def inst = Jenkins.getInstance()

def desc = inst.getDescriptor("hudson.plugins.sonar.SonarPublisher")

def sinst = new SonarInstallation(
  "[name of the sonar installation - I use the host name]",
  [true or false to disable the sonar installation],
  "[sonar server url]",
  "[sonar database url]",
  "[sonar database driver]",
  "[sonar database user]",
  "[sonar database password]",
  "[version of sonar maven plugin - I don't use maven so leave this blank]",
  "[additional properties to pass to maven - again I leave this blank]",
  new TriggersConfig(),
  "[sonar user]",
  "[sonar password]"
)
desc.setInstallations(sinst)

desc.save()