Set workhorse hostname correctly when using nginx

What does this Merge Request do?

There is no direct reason to use 0.0.0.0 when using nginx, so only use it when AutoDevOps is active. And also make sure if we would change the address is changed in the future, workhorse uses the address that nginx expects.

Closes #935 (closed)

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.