- we've too much logic in `chroot_sdcard_apt_get()` we need to re-use
for eg debfoster or any extensions that need to manipulate the apt
cache (which is handled via mounts in that function)
- `chroot_sdcard_apt_get()` now accepts a `chroot_command` env var,
defaulting to `apt-get`
- `chroot_sdcard_custom_with_apt_logic()` splits the params and calls
`chroot_command=... chroot_sdcard_apt_get ...` allowing for custom
calls
c8baf1c888