add end to end encryption enabled to rocketchat settings

ansible/roles/apps/templates/rocketchat-settings.yaml

@@ -14,6 +14,8 @@ extraEnv: |
     # create a different admin user, gets skipped.
   - name: OVERWRITE_SETTING_Show_Setup_Wizard
     value: completed
+  - name: E2E_Enable
+    value: "true"
 
 livenessProbe:
   initialDelaySeconds: 180