Upcoming CI changes - transition to VM based CI

[Sune Vuorela]

On 2025-06-02, Ben Cooksley <bcooksley at kde.org> wrote:
> As launching VMs is not the most efficient approach for all workloads,
> limited support for running Docker containers will be preserved, however
> this support is primarily intended for running linters, sanity checks and
> website builds, and is not intended for running general CI/CD builds.

Okular has compile jobs for testing some minimal baselines of supported
systems. I don't know if Okular is the only one, but I at least think it
is a great idea that we have these kind of jobs also.

(We want people to be able to build Okular preferably on Ubuntu LTS or
later distributions, but due to the timing of last Ubuntu LTS and the
release of KF6, we currently have it on a 'more modern' ubuntu )

Okular also have a custom clazy & clang-tidy jobs that relies on 
python3 -u ci-utilities/run-ci-build.py to provision a setup.

I'm unsure which of these will have to be re-done, discarded or anything
else in this setup.

/Sune