Run a scheduled check to compare software versions between omnibus-gitlab and CNG
We should run a script daily to alert us if there is any difference between the omnibus-gitlab versions in master, and the software we're shipping in the CNG images or charts.
Since there should already be an upgrade issue for both sides, it should suffice to alert (in Slack?) that we're running with the discrepancy.
I think running against master should suffice to start. We can add stable (or other) branches later if we decide it will be useful.