Add mattermost_nginx['log_format'] in the default gitlab.rb
If I want to use a custom log_format for my GitLab's nginx, I can currently manage it from the gitlab.rb
file thanks to :
nginx['log_format'] = "<custom log format>"
Now, if I want to use a custom log_format for my Mattermost's nginx, I see nothing in the default gitlab.rb
that mention it :( But it actually works if I use :
mattermost_nginx['log_format'] = "<custom log format>"
So as this mattermost_nginx['log_format']
seems to be used by omnibus, it could be good to reference it in the default gitlab.rb
to show people this option exists