jenkins-agent docs: Configure agent node label

How to configure installable plugins

Configure jenkins_agent_labels

Use the jenkins_agent_labels configuration to allow assigning different labels to the agent’s node on the jenkins server. Comma-separated list of node labels. If empty, the agent’s node will have the underlying machine’s arch as a label by default, most of the time this will be x86_64. If this value is configured before any integrations with the jenkins charm is established, the label will be applied during the node’s creation once an integration has been established.

juju config jenkins-agent jenkins_agent_labels=label1,label2,label3