# to make debian trixie container for proxmox from scratch:
apt-get update
apt-get install dab
mkdir dab
cd dab
wget -O dab.conf "https://git.proxmox.com/?p=dab-pve-appliances.git;a=blob_plain;f=debian-13-trixie-std-64/dab.conf;hb=HEAD"
wget -O Makefile "https://git.proxmox.com/?p=dab-pve-appliances.git;a=blob_plain;f=debian-13-trixie-std-64/Makefile;hb=HEAD"
make
#optional: cleanup
#make clean

The result is a 123MB zst file that only needs to be moved to /var/lib/vz/template/cache/ so that it can be selected in the GUI.

For a minimal image, you can replace dab bootstrap with dab bootstrap --minimal in ‘Makefile’. The template is then only 84MB in size.

It is also possible to pre-install additional packages, change the time zone, permit root login, etc.