Automator choose finder folder and run shell script

I've got a simple shell script that I would like to incorporate into an automator workflow. I just need to double click the application , pick a finder folder and run the command. At the moment it is running in my default user directory. I've found how to do this as a service, but I'd like it to work as an application. How can I get to run in the chosen folder? Optionally a drag and drop onto the application would be nice as well.

You can simply pass the selected folder to the shell script by selecting "as argument" from the "pass input:" dropdown-menu and then adding "$@" at the point in your script where you want the folder path to be used.

To use drag&drop, just remove the "ask for finder items" action and let the "run shell script" receive the input from "application can receive files and folders as input".