Get link to Sonar dashboard in Jenkins when calling 'gradle sonarRunner'

jenkins gradle sonarqube sonar-runner

Sidebar-Link Plugin to the rescue!

Install the plugin.
Put the sonar icon into /var/lib/jenkins/userContent. That's inside JENKINS_HOME. If you don't know where JENKINS_HOME is, take a look in the config file at /etc/default/jenkins.
Set up the link like this in thejob's configuration (your URL will be different):
Done