Installation

openssl passwd -6 -stdin

sudo dd if=<XXX>.img of=/dev/<XXX> bs=4M status=progress oflag=sync
sudo mount /dev/<XXX>1 /mnt
cd /mnt
echo "<USER>:<PWHASH>" > userconf
sudo vi wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=DE
bgscan=""
network={
  ssid="XXX"
  psk="XXX"
}

sudo touch ssh
cd
sudo umount /mnt
sudo mount /dev/<XXX>2 /mnt
sudo vi /mnt/etc/hostname
mkdir /mnt/home/pi/.ssh
chmod 700 /mnt/home/pi/.ssh
cp /home/<XXX>/.ssh/id_rsa.pub /mnt/home/pi/.ssh/authorized_keys
sudo umount /mnt