CI moved to Qt 6.7 for Linux builds

[Michael Reeves]

kdiff3 will make one or two releases but needs only frameworks. This support will end in three months. master is qt6 only now.

Apr 20, 2024 8:35:40 PM Ben Cooksley <bcooksley at kde.org>:

> Hi all,
> 
> I have just flipped the switch that has moved the CI system over to using Qt 6.7 for Linux builds on our SUSE images.
> 
> Should you see any issues with builds failing as a result of packages being missing in the registry then please submit a merge request to sysadmin/ci-management to ensure that build dependency is added to our seed jobs.
> 
> I'll leave the Qt 6.6 package registry and container images in place for another week or so then will schedule them for removal.
> 
> As part of this I have also updated the list of projects with Qt 6 only master branches. Any residual Qt 5 build artifacts the CI system was holding for those projects have now been purged, which may impact downstream projects that depend on those projects that are still on Qt 5.
> 
> On an adjacent note, i'd also like to schedule removing CI support for release/23.08 and Plasma/5.27 builds (by purging all their binaries we currently hold) for the Qt 5.15 series. 
> 
> While checking however I note that several projects still have activity on those branches. Can we please confirm whether any further releases are expected, as i'd prefer to remove anything that isn't being properly maintained anymore.
> 
> Thanks,
> Ben
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