Disable RubyGems to increase performance

By default, RubyGems is enabled, which causes the Ruby interpreter
to load 600+ additional files at startup when gitlab-shell is
designed not to use any external gems.

CHANGELOG

+v5.2.0
+  - Disable RubyGems to increase performance
+
 v5.1.1
   - Revert "Remove old `project` parameter, use `gl_repository` instead"
 

bin/authorized_keys

-#!/usr/bin/env ruby
+#!/usr/bin/env ruby --disable-gems
 
 #
 # GitLab shell authorized_keys. Query GitLab API to get the authorized command for a given ssh key fingerprint

bin/check

-#!/usr/bin/env ruby
+#!/usr/bin/env ruby --disable-gems
 
 require_relative '../lib/gitlab_init'
 require_relative '../lib/gitlab_net'

bin/create-hooks

-#!/usr/bin/env ruby
+#!/usr/bin/env ruby --disable-gems
 
 # Recreate GitLab hooks in the Git repositories managed by GitLab.
 #

bin/gitlab-keys

-#!/usr/bin/env ruby
+#!/usr/bin/env ruby --disable-gems
 
 require_relative '../lib/gitlab_init'
 

bin/gitlab-projects

-#!/usr/bin/env ruby
+#!/usr/bin/env ruby --disable-gems
 
 
 require_relative '../lib/gitlab_init'

bin/gitlab-shell

-#!/usr/bin/env ruby
+#!/usr/bin/env ruby --disable-gems
 
 unless ENV['SSH_CONNECTION']
   puts "Only ssh allowed"

bin/install

-#!/usr/bin/env ruby
+#!/usr/bin/env ruby --disable-gems
 
 require_relative '../lib/gitlab_init'