Change duo-workflow-executor binary needs to be tar gz

What does this merge request do and why?

Change duo-workflow-executor binary needs to be tar gz

This functionality was added in !3956 (merged)

I was originally planning on getting clients to download the executable file but it turns out this was tricky for our clients to use as the docker API we are using to copy the file into the container expects an archive to expand. The .tar.gz file has the added benefit that it is about half the size.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.