What is the image for?

The intended purpose of this image is for it to be used as a Jenkins master which will execute Jenkins pipelines by means of different Jenkins agents. These agents are intended to be added to the Jenkins configuration as Kubernetes pod templates by means of Jenkins Configuration as Code (JCasC).

First, an example (using image-builder-ruby) of configuring the pod templates (as code) in yaml so the Jenkins master is able to create pods in the Kubernetes cluster using said template.

jenkins:
  clouds:
    - kubernetes:
        name: "kubernetes"
        templates:
          - name: "image-builder-ruby"
            label: "image-builder-ruby"
            nodeUsageMode: NORMAL
            containers:
              - name: "image-ruby"
                image: "ghcr.io/liatrio/image-builder-ruby:${builder_images_version}"

And then specifying the agent in the Jenkinsfile for an example step.

stage('Build') {
  agent {
    label "image-builder-ruby"
  }
  steps {
    container('image-ruby') {
      sh "echo 'puts "Hello Ruby"' > hello.rb"
      ruby hello.rb
    }
  }
}

For Jenkins agents that are intended to be used with this master, see our various `image-builder` repositories.

## What is installed on this image?
- Version [2.348](https://www.jenkins.io/download/) of Jenkins.
- Various Jenkins plugins as defined by plugins.txt