Bring support to the jenkins.hook.url system property used by GitHub Branch Source. Perhaps as a default value. Or as an enforced value.

Reference:

• https://github.com/jenkinsci/github-branch-source-plugin/blob/1810.v913311241fa_9/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHook.java#L51-L54
• https://issues.jenkins.io/browse/JENKINS-58942

Workaround

Configure GitHub Plugin explicitly at Manage Jenkins > Configure > GitHub > Advanced > Specify another hook URL for GitHub configuration.