fix(example): Change hostname in docker multiple env examples (#70105) · vercel/next.js@3d6ecf3

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fix(example): Change hostname in docker multiple env examples (#70105)

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### What?

Update the docker with multiple env examples by the correct hostname.

### Why?
I am verry happy when I see this example, I need to deploy a project
with multiple environments,
I tested current example for my machine, but it started but it didn't
connect to app.

I really try this example
https://github.com/vercel/next.js/tree/canary/examples/with-docker-multi-env.
but it doesn't connect to nextjs container because the hostname
configuation is incorrect.

### How?
I created this PR to change hostname from host ```localhost``` to
```0.0.0.0``` in docker with multiple environments
Closes NEXT-
No fixing any issues

Co-authored-by: JJ Kasper <[email protected]>