gitlab: fix CMake command

1 job for master in 15 seconds (queued for 2 seconds)
Name Stage Failure
failed
build Build
-- Configuring done
-- Generating done
-- Build files have been written to: /builds/gauthier.quesnel/bits/build
$ ninja
[1/2] Building CXX object CMakeFiles/test_parameter.dir/test/parameter.cpp.o
[2/2] Linking CXX executable test_parameter
$ ninja install
ninja: error: unknown target 'install'
ERROR: Job failed: exit code 1