Jenkins should save the state of the rbenv

playbooks/roles/jenkins_worker/tasks/main.yml

@@ -10,4 +10,5 @@
 
 - include: system.yml
 - include: python.yml
+- include: ruby.yml
 - include: jscover.yml

playbooks/roles/jenkins_worker/tasks/ruby.yml

+---
+
+# Archive the current state of the rbenv
+# as a starting point for new builds.
+# The edx-rbenv directory is deleted and then recreated
+# cleanly from the archive by the jenkins build scripts.
+- name: Create a clean rbenv archive
+  command: >
+    tar -cpzf edx-rbenv_clean.tar.gz {{ jenkins_rbenv_root }}
+    chdir={{ jenkins_home }}
+    creates={{ jenkins_home }}/edx-rbenv_clean.tar.gz
+  sudo_user: "{{ jenkins_user }}"