Install Mongo ourselves instead of relying on edxlocal role

playbooks/jenkins_worker.yml

@@ -8,7 +8,6 @@
   gather_facts: True
   roles:
     - common
-    - edxlocal
     - role: rbenv
       rbenv_user: "{{ jenkins_user }}"
       rbenv_user_home: "{{ jenkins_user_home }}"

playbooks/roles/jenkins_worker/tasks/system.yml

@@ -27,7 +27,7 @@
         state=directory
 
 - name: jenkins | Install system packages
-  apt: pkg=${item}
+  apt: pkg=${item} update_cache=yes state=present
   with_items:
     - build-essential
     - gfortran
@@ -39,6 +39,7 @@
     - libgeos-dev
     - libmysqlclient-dev
     - libxslt1-dev
+    - mongodb
     - npm
     - pkg-config
     - unzip