gitlab-ci: fix stage names

7 jobs for migration-siwaa2 in 3 minutes and 53 seconds (queued for 5 minutes and 51 seconds)
Name Stage Failure
failed
build azodyn_sunflo Build

Total Test time (real) = 16.77 sec

The following tests FAILED:
7 - test_downloadmanager (Failed)
Errors while running CTest
The command '/bin/sh -c git clone https://github.com/vle-forge/vle.git && cd vle && mkdir build && cd build && cmake -G "Ninja" -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=RelWithDebInfo -DWITH_CVLE=ON -DWITH_GVLE=OFF .. && ninja && ninja install && vle-2.1 --restart && ctest --output-on-failure && rm -fr build' returned a non-zero code: 8
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 8