Enable CD for Leastload plugin

[hashar]

Link to GitHub repository

https://github.com/jenkinsci/leastload-plugin/

Link to the PR enabling CD in your plugin

The required changes in the plugin repository are proposed in jenkinsci/leastload-plugin#19

CD checklist (for submitters)

• I have provided a link to the pull request in my plugin, which enables CD according to the documentation.

Reviewer checklist

• Check that the $pluginId Developers team has Admin permissions while granting the access.
• In the case of plugin adoption, ensure that the Jenkins Jira default assignee is either removed or changed to the new maintainer.
• If security contacts are changed (this includes add/remove), ping the security officer (currently @Wadeck) in this pull request. If an email contact is changed, wait for approval from the security officer.

[alecharp]

Looks good.

[hashar]

Thank you!