Multipass simulates a Ubuntu ARM on a Mac M1

[kerembakir]

Bootstrapping the local test network on a M1 Mac will result in an error: '/usr/local/bin/ash: line 3: /opt/avalanche/ash-cli/bin/ash: cannot execute binary file: Exec format error'

Multipass simulates a Ubuntu ARM and on a Mac M1. The issue comes from the fact that the /opt/avalanche/ash-cli/bin/ash binary is the one for x86

[kerembakir]

Tested PR and works!