Worker process should also be waited

[dorinelfilip]

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Description

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There are cases (such as the port being already in use or other fatal errors) when the server closes unexpectedly and the worker process is left running in the background with no easy option to catch it.

I changed the run command, such that it also waits for the worker. I have also add some red messages to point the die event of the server process.

Checklist

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• [x] I'm aware of the code of conduct.
• [x] I've created logical separate commits and followed the commit message format.
• [x] I've added relevant test cases.
• [x] I've added relevant documentation.
• [] I've marked translation strings.
• [ ] I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
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