Allow .rpm Release Job to Publish Flat Repository Format

[hollowaykeanho]

Description

Based on Red Hat's RPM repository's engineering specification, it is possible to publish a flat rpm repository (no repodata/) directory (Referring: https://developers.redhat.com/articles/2022/10/07/whats-inside-rpm-repo-file). However, some minor manual patches is required since Red Hat's existing toolkit does not natively supports it.

Expected Behavior

.rpm repository can be published in flat and conventional modes.

Current Behavior

.rpm repository can only be published in conventional modes.

Associated Data Files

No response

[hollowaykeanho]

Implemented in 6177cca