Ensure we don't include generated files into git

Author: logicminds

Diff for: .gitignore

@@ -32,3 +32,7 @@
 .plan_cache.json
 .resource_types/
 bolt-debug.log
+spec/docker/**/*.tar.gz
+spec/docker/**/*.asc
+spec/docker/**/files/puppet-enterprise*
+spec/docker/.task_cache.json