[DRE-maint] Bug#821377: Acknowledgement (gitlab: update fails)

[Xavier Bestel]

Now even after a purge I can't reinstall gitlab.
Same error:

Bundle complete! 121 Gemfile dependencies, 253 gems now installed.
Use `bundle show [gemname]` to see where a bundled gem is installed.
Running final rake tasks and tweaks...
gitlab_production database is not empty, skipping gitlab setup
fatal: Not a git repository (or any of the parent directories): .git
Precompiling assets...
fatal: Not a git repository (or any of the parent directories): .git
Failed to start gitlab.target: Unit gitlab.target is masked.
dpkg: erreur de traitement du paquet gitlab (--configure) :
 le sous-processus script post-installation installé a retourné une erreur de sortie d'état 1
Des erreurs ont été rencontrées pendant l'exécution :
 gitlab