docker artifacts test: install sshd on it's own or use `docker exec`

[fruch]

Since the sshd is going to be removed out of the scylla docker image, we should adapt the test code to manage without it.

with one of two options: 1) use docker exec instead ssh 2) install sshd on our own into the image we are using for the test (which we have anyhow)

@dkropachev @enaydanov I think that in k8s, we are not using ssh either, correct me if i'm wrong.

[github-actions[bot]]

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[fruch]

weird, I don't remember what we did at the end, I think we install sshd on our own, so it's not really relevant anymore