Setup issue-bot
As in other projects like [alpm/alpm](https://gitlab.archlinux.org/archlinux/alpm/alpm), [arch-boxes](https://gitlab.archlinux.org/archlinux/arch-boxes), [devblog](https://gitlab.archlinux.org/archlinux/devblog) and [signstar](https://gitlab.archlinux.org/archlinux/signstar), it makes sense to setup [issue-bot](https://gitlab.com/gitlab-org/distribution/issue-bot), so we are notified with a issue if the pipeline fails (e.g. the monthly release or perhaps a nightly test?).
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