Piere (a.k.a Pingou), Nils and me worked on Rpmautospec [1] to solve this problem few months ago.
It is a koji plugin as well as CLI tool that makes bumping the release field and generating changelog problem of Koji,
instead of package-maintainer. Currently it sits deployed in staging koji, so you can give it a test-drive :-)

We hope we can return to it later this year, to have it deployed in prod koji.

[1] https://docs.pagure.org/Fedora-Infra.rpmautospec/principle.html

On Mon, Jul 6, 2020 at 8:22 AM Florian Weimer <fweimer@redhat.com> wrote:
* Björn Persson:

> The macro could be defined like this for example:
>   %buildtag .%(date +%%s)

Using time for synchronization is always a bit iffy.

> It would be used in each spec like this:
>   Release: 1%{?dist}%{?buildtag}

We could put the Koji task ID directly into the %dist tag.  We know that
this works in principle.  If we are worried that the number gets too
large, we could subtract the current task ID at the time the fcNN part
of the %dist tag changes.

The %dist tag is not recorded in the changelog by most packages, so the
changelog does not need changing.

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