nginx was not configured correctly to handle static routes due to
which user uploaded files (in issues/wiki/avatar) were not being
displayed.
This issue was particularly visible when gitlab was configured to
use a relative url root.
This commit fixes the issue.
if GITLAB_RELATIVE_URL_ROOT was configured (e.g. /gitlab), the application
was not accessible at http://git.local.host/gitlab. The trailing '/'
character was required.
This commit fixes the issue.
