Merge branch '173-remove-bin-install-command' into 'master'

Decouple `bin/compile` and `bin/install` from code in `lib/`

See merge request gitlab-org/gitlab-shell!340

bin/install

 #!/usr/bin/env ruby
 
-require_relative '../lib/gitlab_init'
-
-#
-# GitLab shell, invoked from ~/.ssh/authorized_keys
-#
+# Load ROOT_PATH and access the minimum necessary config file
+require_relative '../support/go_build'
+require_relative '../support/gitlab_config'
 
 config = GitlabConfig.new
 key_dir = File.dirname("#{config.auth_file}")

support/gitlab_config.rb

+require 'yaml'
+
+class GitlabConfig
+  attr_reader :config
+
+  def initialize
+    @config = YAML.load_file(File.join(ROOT_PATH, 'config.yml'))
+  end
+
+  def auth_file
+    @config['auth_file'] ||= File.join(Dir.home, '.ssh/authorized_keys')
+  end
+end

support/go_build.rb

@@ -2,8 +2,8 @@
 
 require 'fileutils'
 
-# This will set the ROOT_PATH variable
-require_relative '../lib/gitlab_init'
+# Determine the root of the gitlab-shell directory
+ROOT_PATH = ENV.fetch('GITLAB_SHELL_DIR', File.expand_path('..', __dir__))
 
 module GoBuild
   GO_DIR = File.join(ROOT_PATH, 'go')