Integration Test archiso (using new cloud-init support) WITHOUT gitlab CI integration

While running into #85 (closed), it occurred to me that it would be neat if one could just make test.

Testing here could just be run_archiso for all profiles, to start with.

With the new cloud-init support (if it works..), make test could also do something like ssh localhost echo "hello, world".

@dvzrv @nl6720 have this been looked into before? Would a contribution for this be welcome?