Fix bash variable errors at workflow builder cmd
Fix bash variable errors at workflow builder cmd

* Fix variable errors, use $
* Only scan for `*.wf.yaml` files as archive may contain other `*.yaml` files (happened in real use case)
* Fix parse call by removing wrong `>` redirection call
fission/fission-workflows,fission/fission-workflows,fission/fission-workflows,fission/fission-workflows