feat: Persistant MAC address (#646)

  fi

  if [ -z "$VM_NET_MAC" ]; then

    local file="$STORAGE/dsm.mac"

    if [ -f "$file" ]; then

      VM_NET_MAC=$(<"$file")

    else

      # Generate MAC address based on Docker container ID in hostname

      VM_NET_MAC=$(echo "$HOST" | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:11:32:\3:\4:\5/')

      echo "${VM_NET_MAC^^}" > "$file"

    fi

  fi

  VM_NET_MAC="${VM_NET_MAC^^}"