Add the ability to install extra system packages.

playbooks/roles/jenkins_master/defaults/main.yml

@@ -68,3 +68,6 @@ jenkins_debian_pkgs:
     - maven
     - daemon
     - python-pycurl
+
+# Extra packages need for a specific jenkins instance.
+JENKINS_EXTRA_PKGS: []

playbooks/roles/jenkins_master/tasks/main.yml

@@ -7,6 +7,13 @@
   tags:
   - jenkins
 
+- name: jenkins_master | install jenkins extra system packages
+  apt:
+    pkg={{','.join(JENKINS_EXTRA_PKGS)}}
+    state=present update_cache=yes
+  tags:
+  - jenkins
+
 - name: jenkins_master | create jenkins group
   group: name={{ jenkins_group }} state=present