[TASK] Finalize changelog generation

[Thaodan]

Currently the changelog is generated through a patched version of dnf-repodiff. The PR needs to be finalized and possible made so it can be reused with dnf and then automated.

repodiff

• DNF-PR: https://github.com/rpm-software-management/dnf-plugins-core/pull/456

Changelog generation

The changelog is generated by calling repodiff for example like this:

export LANGUAGE=en_GB.UTF-8
export LC_ALL=en_GB.UTF-8

 dnf repodiff --repofrompath=n,https://repo.sailfishos.org/obs/nemo:/testing:/hw:/sony:/kumano:/4.4.0.68/latest_aarch64 --repofrompath=o,https://repo.sailfishos.org/obs/nemo:/testing:/hw:/sony:/kumano:/4.4.0 --repo-old=o --repo-new=n --arch=aarch64 --hide-author  > Changelog.md

The repository address can change depending on release or device and the top of the changelog can be removed.