Easy deployment

[prhod]

For the moment, deployment is made my manually change de config files :

• web/vapour-style.json : config of the layer
• web/glstyle.json : link to the sprite
• settings/trex.toml : base URL for tiles
• docker-compose.yml : traefik infos
  It could be great to have a more update friendly deploy system

[frodrigo]

The static builder already make this.
We should split it to keep the interesting part.

[nlehuby]

I'd rather use env variables to store this config.

Docker-compose even has a smart process to override env variables for each deployment environement.

We may need to make some evolution in t-rex to handle config as env var. And as a static web page doesn’t have access to env variables, we will still need to pre-generate the frontend files to add appropriate config.