Please review PR #14 for steps-create-zip

Hi,

I’ve submitted a PR to the steps-create-zip repository and would appreciate a review.

Summary of the issue:
This step creates a zip file during the build flow. Users can specify a filename, and if the filename doesn’t end with .zip, the step should append it automatically. However, this feature is not working correctly due to a bug in the file extension check.

Fix:
filepath.Ext() returns a string including the dot (e.g., .zip), but the original code was comparing it against "zip" without the dot. I fixed it to ".zip".

If I’ve missed anything in the contribution guidelines, please let me know!

Thank you.