use cmake for ubuntu CI, CMakeFileLists tweaks. (#929)

use cmake for ubuntu CI, CMakeFileLists tweaks. (#929)

refactor ubuntu workflow using a matrix.
create gpsbabelfe_lupdate, gpsbabelfe_lrelease targest on all platorms.
add USES_TERMINAL to check-vtesto so we can see test progress live.
update docker images for focal and jammy for Qt5 cmake issues.
update docker image for jammy adding Qt6.  This uses a PPA to work
around https://bugs.launchpad.net/ubuntu/+source/qt6-base/+bug/1970057.
Note the PPA isn't actually required to build, but it is required to
run the GUI, i.e. all users on jammy using Qt6 who want to run the GUI will
need the PPA, or need ubuntu to incorporate the upstream debian fix!