Copied from rancher community catalog as starting point

templates/Jenkins-CI/0/docker-compose.yml

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+jenkins-primary:
+  image: "jenkins/jenkins:2.92"
+  ports:
+    - "${PORT}:8080"
+  labels:
+    io.rancher.sidekicks: jenkins-plugins,jenkins-datavolume
+    io.rancher.container.hostname_override: container_name
+  volumes_from:
+    - jenkins-plugins
+    - jenkins-datavolume
+  entrypoint: /usr/share/jenkins/rancher/jenkins.sh
+jenkins-plugins:
+  image: rancher/jenkins-plugins:v0.1.1
+jenkins-datavolume:
+  image: "busybox"
+  volumes:
+    - ${volume_work}:/var/jenkins_home
+  labels:
+    io.rancher.container.start_once: true
+  entrypoint: ["chown", "-R", "1000:1000", "/var/jenkins_home"]

templates/Jenkins-CI/0/rancher-compose.yml

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+.catalog:
+  name: Jenkins
+  version: 2.92-rancher1
+  questions:
+
+  - variable: "PORT"
+    type: "int"
+    label: "Port Number"
+    description: "Which port should Jenkins listen on?"
+    default: 8080
+    required: true
+
+  - variable: "volume_work"
+    description: "Work volume to save jenkins data"
+    label: "Work volume:"
+    required: true
+    default: "/var/lib/docker/jenkins-ci"
+    type: "string"
+
+  - variable: "plugins"
+    type: "multiline"
+    label: "List of Plugins"
+    description: |
+      List of plugins in the format <plugin_name>[:<version>]
+      one entry per line.
+    default: |
+      credentials
+      git
+      git-client
+      github
+      github-api
+      github-oauth
+      greenballs
+      junit
+      plain-credentials
+      scm-api
+      ssh-credentials
+      ssh-slaves
+      swarm
+
+jenkins-primary:
+  metadata:
+    plugins: |
+      ${plugins}