**Summary**
Add the ability to start smoketests on `arm64` platform
The current implementation of smoketests is hardcoded to `amd64` in several places.
- https://github.com/vyos/vyos-build/blob/88897baad505ff5d946f694877324ac87a295f0d/Makefile#L34
- https://github.com/vyos/vyos-build/blob/88897baad505ff5d946f694877324ac87a295f0d/scripts/check-qemu-install#L179
And probably some other
The idea in dehardcode ARCH or/and add arg `ARCH`
for example:
```
ARCH ?= amd64
...
.PHONY: test-no-interfaces-no-vpp
.ONESHELL:
test-no-interfaces-no-vpp: checkiso
scripts/check-qemu-install --debug --configd --smoketest --uefi --no-interfaces --arch $(ARCH) --no-vpp build/live-image-$(ARCH).hybrid.iso
```
**Use case**
Execute smoketest and config load tests on different arch