don't update rake gem on jenkins

playbooks/roles/jenkins_worker/meta/main.yml

@@ -4,3 +4,4 @@ dependencies:
     rbenv_user: "{{ jenkins_user }}"
     rbenv_dir: "{{ jenkins_home }}"
     rbenv_ruby_version: "{{ jenkins_ruby_version }}"
+    jenkins_worker: true

playbooks/roles/rbenv/tasks/main.yml

@@ -119,11 +119,13 @@
 
 - name: remove rbenv version of rake
   file: path="{{ rbenv_dir }}/.rbenv/versions/{{ rbenv_ruby_version }}/bin/rake" state=absent
+  when: jenkins_worker is not defined or not jenkins_worker
 
 - name: install rake gem
   shell: "gem install rake -v {{ rbenv_rake_version }}"
   sudo_user: "{{ rbenv_user }}"
   environment: "{{ rbenv_environment }}"
+  when: jenkins_worker is not defined or not jenkins_worker
 
 - name: rehash
   shell: "rbenv rehash"