automated iso download for pxe boot

install.sh

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+set -euo pipefail
+gdisk $DISK
+mkfs.fat -F 32 $ESPPART
+cryptsetup luksFormat $ROOTPART
+cryptsetup open $ROOTPART root
+mkfs.ext4 $ROOTPART
+mount /dev/mapper/root /mnt
+mount $ESPPART --mkdir -o umask=077 /mnt/boot
+mkdir /mnt/var
+mkswap -F -s $SWAPSIZE /mnt/var/swapfile
+swapon /mnt/var/swapfile
+mkdir -p /mnt/etc/nixos
+nixos-generate-config --root /mnt --kernel latest --flake
+#copy backup
+nixos-install --no-root-passwd --no-channel-copy --flake "/mnt/etc/nixos#nixos"
+sbctl enroll-keys --yes-this-might-brick-my-machine
+systemd-cryptenroll --tpm2-device=auto --tpm2-pcrs=0+2+7 $ROOTPART