Backport sprint Gothenburg to `maintained` branches

Created by: fdobrovolny

As per https://github.com/SovereignCloudStack/issues/issues/387.

The following PRs were merged and not already backported as part of #443 (closed)

PR	maintained/v5.x	maintained/v5.0.x
#456 Add check to Makefile for clouds.yaml presence	🌱	❌

We should decide what should be backported if anything.