Before I created these I had looked for other examples.
First there's a package in community for the virtualbox guest iso:
https://www.archlinux.org/packages/community/any/virtualbox-guest-iso/
VirtualBox guest ISO package offers an ISO image which is used by VirtualBox software to install guest utilities. It's not an operating system but a CD image used by guest Linux, Windows and Solaris operating systems with the needed drivers.
Additionally, despite the description, this package also just downloads and iso and installs it into a directory:
While even the grml-iso could be considered unuseful, at least it aims to install it into the grub2 menu (using the grml-rescueboot package). The tails-iso and the archlinux-iso packages do NOTHING at all, just wasting disk space without any other purpose. Whoever will want a fresh Arch Linux image will have to download it from the official mirrors, what humans do since the installation images exist. -- Fabio Castelli aka Muflone