provide --host flag for alternative hosts (otherwise scully not works)

[willi84]

🧩 Feature request

Description

For some working environments, where localhost is by default not available to use (e.g. strict company VMs).
When I start npm run scully the mechanism tries to connecto to http://localhost:1864/_pong. But this is not possible in my enviroment, because it redirects to http://myhost:1864/_pong

Describe the solution you'd like

Angular provides for ng serve a --host flag, this could be also a solution for you.
The first line it crashed for me was here:

scully/scully/utils/waitForServerToBeAvailable.ts

Line 13 in 8ce6c13

httpGetJson('http://localhost:1864/_pong', {suppressErrors: true})

But there are maybe also other points.

Describe alternatives you've considered

I tried to edit it directly in the source code. It worked until the next issue (no chromium available for my OS)

[aaronfrost]

@jorgeucano is this replaced with the feature you are adding around hostUrl?

[jorgeucano]

@aaronfrost Yes, WIP