add clean_venv option (#41069)

group_vars/all

@@ -1,3 +1,4 @@
+clean_venv: false
 compile_theme: true
 django_version: 1.11.18
 git_ssh: false

roles/base/tasks/main.yml

@@ -37,6 +37,12 @@
   become: yes
   become_user: postgres
 
+- name: clean the virtualenv
+  file:
+    path: "{{venv_py3}}"
+    state: absent
+  when: clean_venv
+
 - name: create the virtualenvs and install django
   pip:
     name: django