Include bookworm-backports in image
19bc500bf1
Hibbian image spec for pi4 added
ff7fdbf07c
Switch from qemu-debootstrap to debootstrap.
319fd42944
Document zerofree explicitly (because of #1021341).
fd5b7b8e28
Fix xzcat argument.
20b903c771
Simplify systemd-timesyncd management.