Problems while attempting configure the CI to build Konqueror for both KF5 and KF6

[Stefano Crocco]

Hello to everyone,
in the last weeks, I worked on making Konqueror compile with both KF5 and KF6. 
I had all the code on my PC and today I tried to upload it on GitLab. I 
created a kf6 branch for Konqueror, pushed the code in my Konqueror fork and 
created a merge request [1] for the kf6 branch. However, I don't know what to 
do so that the CI tries compiling the code both with KF5 and KF6.

I wasn't able to find any documentation explicitly stating how to do this, so 
Konqueror's current .gitlab-ci.yml with that of other KDE programs, I added 
the following two lines at the former:
  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/
linux-qt6.yml
  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/
freebsd-qt6.yml

Unfortunately, this doesn't seem to work: the CI will indeed try to compile 
Konqueror with both KF5 and KF6 in linux and FreeBSD, but the compilation with 
KF6 fails in both platforms. I don't know whether this is because I didn't 
correctly configure the CI or because there's something wrong in the way I 
changed the CMakeLists.txt files (on my system Konqueror built correctly with 
both KF5 and KF6).

The error message I get from the CI is the following (the full build log is 
attached):
Exception: Unable to locate requested dependency in the registry: kdesu 
(branch: kf5)

If I read this correctly, it seems that the system tries to find kdesu in the 
kf5 branch which seems wrong, since the compilation should be for KF6.
Looking at the CMakeLists.txt files, I can't spot anything wrong. Before going 
on investigating them, I'd like to be sure that what I did to make the CI 
compile Konqueror with KF6 is correct and there's nothing else to do. Can 
anyone give any hints or pointers to documentation about this?

Thanks in advance

Stefano

[1] https://invent.kde.org/network/konqueror/-/merge_requests/237
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