Allow disable of git-autocommit of system policy on Update
When updating, the rudder-update script auto-commits the new set of system policies, which is nice...
But when one has modifications on the system policy, we'd like to have a possibility to review the changes before it is commited and a technique-reload is triggered.
We propose checking an environment-variable, that would disable this auto-commit feature and warn the user to review the changes manually.
found in: Update from 2.11.11 -> 2.11.13