Rollback a Project Environment (to a previous Snapshot)
> As an Aegir user
>
> In order to revert to a previous Snapshot of a Project
>
> I need to Rollback a Project Environment
Notes:
* Doing this in-place is slightly more risky, and results in downtime if a rollback is needed
* However, it's also much faster than recovering from a full archive backup, as we can simply:
* Check out the snapshotted commit hash
* `composer install` (rebuild codebase with contrib/vendor as it was at earlier commit)
* Restore the snapshotted sql dump
epic