Provides support tasks for maintaining Jenkins
Ansible playbook is run nightly to make sure each system is kept updated, reset to a reasonable working state (we aren't immutable yet) and cleaning up any cloud resources.
The playbook used is located in jobs/infra/playbook-jenkins.yml.
Credentials used in the playbook are pulled from the Jenkins Credentials
store, attempting to run this locally would require that those credential
environment variables are met (seen in jobs/ci-master.yaml under - wrapper section.