Excessive tests in Ruqola / dependencies not built as part of the Craft caches

[Ben Cooksley]

Hi Laurent, all,

Over the past week or two Sysadmin has received a number of complaints
regarding a lack of CI builder availability, primarily from those who work
on Plasma. Investigation has revealed that Ruqola appears to use a
disproportionately high amount of CI time compared to the size of the
project and it's activity.

This appears to be driven by the fact that Ruqola has a large number of
tests that do not take very long to execute (700 or so tests, yet done in 6
minutes - with many of these being less than 1 second to run). Given that
every single one of these unit tests needs to have automoc / compiler /
linker run on it i'd suggest that similar tests be merged into the same
compilation unit (you can run the individual tests, but keep similar tests
together in the same unit test). This would also explain why the build time
on Windows is significantly longer, as NTFS does not perform well when
compared to Linux file systems, even on NVMe storage.

FreeBSD also has 8 tests failing (timing out, with a 1 minute timeout) and
Windows has three tests failing with timeout.

If the Ruqola developers could please merge their unit tests into a smaller
number of unit tests and look into the broken unit tests as a priority that
would help your fellow KDE Developers by reducing the wastage of CI time.

On the Craft based builds, Ruqola also uses a stable version of a
dependency (ktextaddons) that is not in the Craft cache. Projects making
use of Craft CD builds should review their blueprints and ensure where-ever
possible that their dependencies are all in the list of projects built in
the shared cache. In the case of KTextAddons, adding it to the cache should
save ~10 minutes on Windows and ~3-4 minutes on Linux (Appimage) per
pipeline run.

Details on the shared cache can be found at
https://invent.kde.org/sysadmin/craft-ci. A merge request to correct this
oversight as well as any other project it uses (Pulseaudio also appears to
be a candidate) would be appreciated .
Other projects using Craft CD builds should please review their Blueprints
as well for similar oversights.

Thanks,
Ben
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