BUG #16412: Make postgres rpm repository and packages compatible with new modular package system

The following bug has been logged on the website:

Bug reference: 16412
Logged by: Dmytro
Email address: zdm(at)softvisio(dot)net
PostgreSQL version: 12.2
Operating system: Linux, Centos 8
Description:

Hi.
I am unable to setup automated rpm build for postgres extensions on fedora
copr, because unable to install postgresql12-devel package in chroot
environment (where i have no permissions to modify dnf configuration and
execute "sudo dnf -qy module disable postgresql").

Could you please make your repo and packages compatible with the modular
system? Seems, that this is not hard at all,
Here are some references:
https://dnf.readthedocs.io/en/latest/modularity.html

All you need - is to create proper modulemd file and place it to the repo
root.