v1.6.11

- efi: add use/efi/dtb to +efi target
- tar2fs: copy default devicetree to ESP
- net-eth: setup en*.network for networkd-dhcp{,4}
- doc/params.txt: add description for ISO_LEVEL
- kernel: set default KFLAVOURS=6.12
- tar2fs: use up register for grub efi binaries (aarch64, riscv64, loongarch64)
- initrd-bootchain: add variable BOOTCHAIN_TMPFS_SIZE
- add latest commits from education, workstation, kworkstation