Gets stuck when building an image while installing packages

I wanted to build an install image but ran into a problem:
Even on default settings, both for the current commit and the 7.0 release when building according to the 7.0 terraform config I get stuck while the script is installing packages. For me it just gets stuck on
`Get:26 [http://ftp5.gwdg.de/pub/linux/debian/ubuntu](http://ftp5.gwdg.de/pub/linux/debian/ubuntu) jammy/main DEP-11 48x48 Icons [100.0 kB]`
for hours without ever continuing.
One time it also got stuck on `Get:20 http://packages.oth-regensburg.de/ubuntu jammy/restricted amd64 Packages [129 kB]`

is this a known issue / something I may have caused?
Here is the terraform.conf I used for both, with the exception that I also tried initially with `MIRROR_URL="http://archive.ubuntu.com/ubuntu/"` and `MIRROR_URL="http://azure.archive.ubuntu.com/ubuntu/"`, but changed to the Uni Stuttgart one since I get better performance from that one and I hoped that would change my problem.

```
# target architecture - i386, amd64 or all
ARCH="amd64"

# base codename
BASECODENAME="jammy"

# base version
BASEVERSION="22.04"

# distribution codename
CODENAME="horus"

# distribution version
VERSION="7.0"

# distribution channel
CHANNEL="stable"

# distribution name
NAME="elementary OS"

# mirror to fetch packages from
MIRROR_URL="https://ftp.uni-stuttgart.de/ubuntu/"

# use HWE kernel and packages?
HWE_KERNEL="yes"
HWE_X11="no"

# use appcenter ppa
INCLUDE_APPCENTER=""

# suffix for generated .iso files
OUTPUT_SUFFIX=""

# folder suffix for the package lists to use
PACKAGE_LISTS_SUFFIX="default"

```