add support for changing port

jenkins.yaml

@@ -24,6 +24,24 @@
           - jenkins
         state: present
 
+    - name: Create a jenkins.service override directory
+      file:
+        owner: root
+        group: root
+        mode: 0755
+        path: /etc/systemd/system/jenkins.service.d
+        state: directory
+
+    - name: Set up jenkins.service override
+      ini_file:
+        dest: /etc/systemd/system/jenkins.service.d/port_override.conf
+        owner: root
+        group: root
+        mode: 0644
+        section: Service
+        option: Environment
+        value: "JENKINS_PORT={{  JENKINS_PORT | default('8080') }}"
+
     - name: Start Jenkins service
       service:
         name: jenkins