Add --public-host command line feature for Universal Dev Server

[laurencefass]

Feature Request

What is the desired behavior?

I can set the --public-host when starting Angular CSR dev server with npm start

e.g.

"start": "ng serve --host 0.0.0.0 --port 3604 --disable-host-check --public-host https://mydomain.com/ssr",
this is not currently supported by "npm run dev:ssr" command.

What is the use-case or motivation for the desired behavior?

1. run multiple apps from single domain.
2. use reverse proxy for app routing.

Is there anything else we should know?

Is there a workaround to enable the same configuration as --public-host for Universal HMR?

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