hrmpf.packages: add bcachefs-dkms

mklive.sh: clean up kernels on aarch64 as well

bump kernels

hrmpf.packages: update

update memtest86+ to 8.00

Move to x86_64.packages

Improve .gitignore (#44)

update memtest86+ to 7.20

hrmpf.packages: add new packages

.github/workflows/hrmpf: fix default version, extra args from env

.github/workflows/hrmpf: use arm runner for arm image

.github/workflows/hrmpf: various improvements

mkhrmpf: set a custom filename, read extra arguments from environ

slim down initramfs

remove /boot files inside squashfs