unlink runner from coordinator

CHANGELOG

+v5.2.1
+  - Add ability to unlink runner from CI coordinator
+
 v5.2.0
   - Add RUNNER_DESCRIPTION and RUNNER_TAG_LIST that can be send during runner's registration

bin/unlink

+#!/usr/bin/env ruby
+require 'bundler/setup'
+require_relative '../lib/unlink'
+
+GitlabCi::Unlink.new
+exit

lib/config.rb

@@ -37,6 +37,10 @@ module GitlabCi
       end
     end
+    def destroy
+      File.delete(config_path)
+    end
+
     private
     def config_path

lib/network.rb

@@ -94,6 +94,17 @@ module GitlabCi
       end
     end
+    def unlink_runner
+      opts = {
+        body: default_options.to_json,
+        headers: {"Content-Type" => "application/json"},
+      }
+
+      response = self.class.delete(api_url + '/runners/delete', opts)
+
+      response.code == 200
+    end
+
     private
     def broadcast message

lib/unlink.rb

+require_relative 'config'
+require_relative 'network'
+require 'yaml'
+
+module GitlabCi
+  class Unlink
+    def initialize
+      unlink_runner
+    end
+
+    private
+
+    def unlink_runner
+      status = Network.new.unlink_runner
+
+      if status
+        Config.new.destroy
+        puts 'Runner unlinked successfully!'
+        return
+      else
+        puts 'Failed to unlink this runner. Perhaps the runner is not subscribed yet or you are having network problems'
+      end
+    end
+  end
+end