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...added fstrim
Change bz2 compression with zstd compress is test script
Add prepdisk option to clean ext type file systems using fstrim and with zerofree.
remove linuxrc from busybox and /linuxrc since initrd no longer used, so not needed for initramfs
Command line script to flash SD card images of any kind
Command line script to flash SD card images of any kind. Note that for some devices (e.g. Raspberry Pi), at the end of the flashing process the tool tries to customize the SD card e.g. it configures a hostname or WiFi. And with a cloud-init enabled image you can do much more like adding users, SSH keys etc.