Add example for ECS Fargate/EFS Jenkins authentication (#6991)

* Add example for ECS Fargate/EFS Jenkins authentication

Since ECS Fargate is serverless, one cannot access its jenkins_home other than from a machine (EC2 for example) that actually mounts and owns its EFS storage.

That way we provide user/group of a defatul local user which has the same uid/gid 1000 as the default jenkins user inside the container and also can authenticate at Jenkins URL.

I feel this is not as straightforward from the docs and someone might benefit from such an example being present

* Added an empty line

* Float value now in single quotes

* Use UID/GID instead user/group name

plugins/modules/jenkins_plugin.py

@@ -27,7 +27,7 @@ options:
   group:
     type: str
     description:
-      - Name of the Jenkins group on the OS.
+      - GID or name of the Jenkins group on the OS.
     default: jenkins
   jenkins_home:
     type: path
@@ -47,7 +47,7 @@ options:
   owner:
     type: str
     description:
-      - Name of the Jenkins user on the OS.
+      - UID or name of the Jenkins user on the OS.
     default: jenkins
   state:
     type: str
@@ -195,6 +195,29 @@ EXAMPLES = '''
     url_password: p4ssw0rd
     url: http://localhost:8888
 
+#
+# Example of how to authenticate with serverless deployment
+#
+- name: Update plugins on ECS Fargate Jenkins instance
+  community.general.jenkins_plugin:
+    # plugin name and version
+    name: ws-cleanup
+    version: '0.45'
+    # Jenkins home path mounted on ec2-helper VM (example)
+    jenkins_home: "/mnt/{{ jenkins_instance }}"
+    # matching the UID/GID to one in official Jenkins image
+    owner: 1000
+    group: 1000
+    # Jenkins instance URL and admin credentials
+    url: "https://{{ jenkins_instance }}.com/"
+    url_username: admin
+    url_password: p4ssw0rd
+  # make module work from EC2 which has local access
+  # to EFS mount as well as Jenkins URL
+  delegate_to: ec2-helper
+  vars:
+    jenkins_instance: foobar
+
 #
 # Example of a Play which handles Jenkins restarts during the state changes
 #