ci(gitlab-ci): use templates from a common repository

5 jobs for !14 with topic/default/regenerate_gitlab_ci in 2 minutes and 32 seconds (queued for 27 seconds)
latest merge request
Name Stage Failure
py3 Tests
=========================== short test summary info ============================
FAILED test/ - TypeError: app...
================== 1 failed, 32 passed, 40 warnings in 45.59s ==================
ERROR: InvocationError for command /builds/cubicweb/cubes/compound/.tox/py3/bin/python -m pytest test (exited with code 1)
___________________________________ summary ____________________________________
ERROR: py3: commands failed
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: command terminated with exit code 1