Upgrade from PG 13 to PG 15 & move to sclorg images

[rooftopcellist]

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[git-hyagi]

Hi @rooftopcellist!

Thank you for your contribution!
By default, this new image will run as user 1000 in vanilla k8s. Because of that, when the bkp-manager container tries to make a copy of /var/lib/pulp/tmp/<worker files> (which has 0700 permission and is owned by user 700), it is getting permission denied error and failing the backup task.

The old image (postgres:13 from dockerhub) had the access permissions because it was running with uid 0 (root).

[rooftopcellist]

Closing this PR as this work will continue in another repo.

[app-sre-bot]

Can one of the admins verify this patch?