add hcloud volume to archlinux.org machine to host ISO files

Due to the massive amount of spam, this MR is already applied.

archlinux.org was low on diskspace and produced a lot of spam/alert mails. Therefore a volume was added to store /srv/ftp which contains the ISOs and archboot files.

Beforehand the backup was fixed. The state before this change is saved as a snapshot in borg.

Edited by Frederik Schwan

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