[DRE-maint] Bug#820804: gitlab: install fails with Could not find gem 'gitlab_git (~> 7.2.22)'

[Olivier Berger]

Package: gitlab
Version: 8.4.3+dfsg-12
Severity: normal

Dear Maintainer,

I've tried to install gitlab on a fresh testing/stretch empty VM, and got :

Setting up gitlab (8.4.3+dfsg-12) ...
Creating/updating gitlab user account...
adduser: The user `gitlab' already exists.
Proceeding with existing gitlab user...
GITLAB_HOST=localhost
Create database if not present
Make gitlab user owner of gitlab_production database...
ALTER DATABASE
Grant all privileges to gitlab user...
GRANT
Verifying we have all required libraries...
Could not find gem 'gitlab_git (~> 7.2.22)' in any of the gem sources listed in
your Gemfile or available on this machine.
dpkg: error processing package gitlab (--configure):
 subprocess installed post-installation script returned error exit status 7
Errors were encountered while processing:
 gitlab

Looks like a show stopper :-/

Many thanks in advance.

Best regards,

-- System Information:
Debian Release: stretch/sid
  APT prefers testing-proposed-updates
  APT policy: (500, 'testing-proposed-updates'), (500, 'stable-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.4.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)