When trying to balena push <fleet-name> is get the following error:
W: The repository 'http://deb.debian.org/debian stretch Release' does not have a Release file.
(...)
W: The repository 'http://security.debian.org/debian-security stretch/updates Release' does not have a Release file.
(...)
The command '/bin/sh -c install_packages xserver-xorg-core xserver-xorg-input-evdev xinit xfce4 xfce4-terminal x11-xserver-utils dbus-x11 matchbox-keyboard xterm' returned a non-zero code: 100
(...)
When replacing stretch-run on line 1 in Dockerfile.template with bookworm it works again (in combination with issue 13).