using *zip*/archive.zip as default for :jenkins_artifact_file

deploy fails with `SSHKit::Runner::ExecuteError: Exception while executing on host <deploy host>: can't convert nil into String` when `:jenkins_artifact_file` not specified

using `*zip*/archive.zip` as default value

if `:jenkins_artifact_file` option not specified - unzipping artifact content and moving to release path.
If it works like this, then I'm cool with it. Just generally in favor of less code if possible. Addition the quotes makes sense; the `execute` method is a bit funny when it comes to how it's arguments are interpreted.