E.g. "balena build -e -h <IP> -p 2375" with the CLI running on a Mac laptop,
using balenaEngine on an Intel NUC device, building an image for the RPi (ARM
image arch). Previously, QEMU setup by the CLI assumed that docker ran on the
same OS as the CLI (Docker for Mac has built-in binfmt_misc support and does
not require additional setup, but balenaEngine on Linux requires explicit QEMU
setup.)
Change-type: minor
Signed-off-by: Paulo Castro <paulo@balena.io>
