Add WARD_ADDRESS environment variable

[adamhl8]

Assuming you intend to merge the other branch which does its config via environment variables, it would be great if you added a WARD_ADDRESS variable so users can choose what address to listen on. In my case, I serve Ward via a reverse proxy, so I only need to have it listen on localhost.

[KotMilkMeoWtwo]

same

[github-actions]

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