Allow to use the command through non-localhost environment

[shavounet]

I've tried to use the CLI with docker, but I couldn't use some commands like platform login due to the php server being binded to localhost :
https://github.com/platformsh/platformsh-cli/blob/8f2669e4d17aaee9cce94b335562b496e1e87421/src/Command/Auth/BrowserLoginCommand.php#L65

Ideally, in this place (and maybe others), it should be configurable (through an ENV variable for example).

Test case : create a simple image (ubuntu with php, git, ssh, ...), install the CLI inside the image, and start a new container with the command platform login and correct port mapping. It should display normal output, but when going on http://localhost:5000/ the connection is marked as closed by remote.

Workaround : I use an API token, but I don't know if there is an other place where this might lead to issues

[pjcdawkins]

Security-wise, it absolutely needs to be on the local loopback interface (127.0.0.1 rather than localhost), so that it doesn't need requests over the network, and so that it can't be served by an external host (e.g. by a malicious attacker somehow taking over localhost via DNS).

The platform auth:password-login command is available for non-browser usage. That's also configurable as the default interactive "login method", mentioned here: https://github.com/platformsh/platformsh-cli#customization

[pjcdawkins]

The presence of auth:password-login and this upcoming help message should resolve this issue:
8baebb4