Ability to recognize bash script that clears file

[christiemolloy]

For steps that are not progressive we got feedback from users that we needed to clear the content in the editor for each new step. Dana added a bash script that wipes the file each step, but Katacoda isn’t recognizing this script and so the content doesn’t refresh in the iframe.

cc: @gsoria

[gsoria]

@dgutride could you please point me to the script that we should call? and the scenario to test it? Thanks!