Update ruby.rb

Author: canihavethisone

lib/puppet/provider/docker_compose/ruby.rb

@@ -14,8 +14,8 @@
   end
 
   has_command(:docker_compose, command(:dockercompose)) do
-    Dir.mkdir('tmp_docker') unless Dir.exist?('tmp_docker')
-    ENV.store('TMPDIR', 'tmp_docker')
+    Dir.mkdir('/tmp_docker') unless Dir.exist?('/tmp_docker')
+    ENV.store('TMPDIR', '/tmp_docker')
   end
 
   def exists?