SetUp RaspberryPi Headleass without installing tool (Raspberry Pi Imager)

RaspberryPi OS has changed sum stuff like default user ... so here is a new guid how to setup you RaspberryPi headless:

1. Download the OS Image from the official page (pick the light version, lol)
2. check the SHA256 sum via sha256sum <PATH_TO_*.IMG.XZ>
3. extrackt the archive via unxz <PATH_TO*.IMG.XZ>
4. Write IMG to SD card via sudo dd if=<PAT_TO*.IMG> of=/dev/<SDCARD> status=progress