guides: deployment: add doc about ROOT_URL

[Castavo]

No description provided.

[multun]

I'm pretty sure more changes are needed to deploy OSRD on the internet using docker-compose. The docker compose setup is designed for development only: no authentication is supported, the front-end is served in development mode (rebuilt on the fly).

I'm not comfortable suggesting this setup unless someone puts real effort into making it safe

[Castavo]

I added a commit about the limited purpose of the docker compose deployment method

[ElysaSrc]

I feel these changes are not required anymore since ROOT_URL is not used anymore : the gateway serves both on the same domain and the front uses a relative path. This setup prevents the need for setting the url and also prevents a bunch of CORS issues.

[Castavo]

@ElysaSrc neat ! Then should I close the PR completely or keep it to add only the detail about the docker-compose deployment being a tad unsafe / not protection ready ?

[ElysaSrc]

@ElysaSrc neat ! Then should I close the PR completely or keep it to add only the detail about the docker-compose deployment being a tad unsafe / not protection ready ?

As you wish, adding a word about the docker compose deployment being unfit for production is a good idea.