Establish Postgres database format upgrade #2780 #2781
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Adds a shell script, to be run by rpm during update, to ensure any Postgres 10 (or later) formated DBs are updated to our current Postgres target version: established by rpm dependencies and the 'alternatives' system.
Fixes #2780
Testing
This script was developed on, and has had initial testing with, an install originally derived from the following installer:
Distribution update from 15.3 to 15.4: https://rockstor.com/docs/howtos/15-3_to_15-4.html
Resulting also in an automatic update to our last stable release of 4.6.1-0.
The above system then represents a reproducer for a pending stable update issue found in the current testing channel; where the far newer Django and psycopg3 there-in are no longer compatible with a Postgres 10 formatted DB: such as a system with the above, or older heritage, will have.