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

6 jobs for !13 with topic/default/regenerate_gitlab_ci in 2 minutes and 8 seconds (queued for 11 minutes and 45 seconds)
latest merge request
Name Stage Failure
py3 Tests
Waiting for pod heptapod-runner/runner-4npbxq8c-project-105-concurrent-02gvpj to be running, status is Pending
Running on runner-4npbxq8c-project-105-concurrent-02gvpj via heptapod-runner-gitlab-runner-5d9cd77755-tqcfm...
Getting source from version control
Creating Mercurial repository
abort: error: Try again
Uploading artifacts for failed job
/bin/bash: line 131: cd: /builds/cubicweb/cubes/sioc: No such file or directory
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1