Batou-ext

- add an option to move mailhog log output (`stdout` + `stderr`) to a different namespace, e.g. "mailhog". see systemd.exec(5) for more information

- add an option to disable `stdout` logging for the mailhog service

- improve dectection of a versions file for versions updates

- fix the oci.Container verify method not throwing an updaterequired on changes to the docker container's environment file

- Add systemd-run async cleanup option for SymlinkAndCleanup removals

- Change the behaviour of the batou_ext.versions updater to allow environments to share a branch

* Added a component `batou_ext.git.Remote` which allows to manipulate remotes of a git repository.

- Improve output handling for the `PurgePackage` component. Will not appear like a fatal error in logs anymore when the package has been purged already or is not installed for another reason

* Make it possible to add arbitrary additional configuration to a service created by a `SystemdTimer()`.

* Add `nixos.NixOSModule` to inject component attributes into .nix files.

* Add `*.md` to the release, so it can actually be used.

- Add release process with changelog (FC-33250).