[FEATURE] handle domain names starting with a number via env var prefix

[ppenguin]

What's needed and why?

I have several domains (and/or vhosts) starting with a number, and it's impossible to configure BW for them via environment variables.

The reason is that bash doesn't allow environment variables to start with a number.

Implementations ideas (optional)

A simple, consistent and discoverable way would be to allow multi-site variables to have an underscore _ prefix, that will be sanitised when processing. For that matter, one could just allow any processed env var to have a _ prefix and just indiscriminately trim it off as the first processing step. This is safe because domain or host names cannot have underscores.

So something like

_1nteresting.io_REVERSE_PROXY_URL="..."

will lead to a corresponding nginx server config in /etc/nginx/1nteresting.io/ with server_name 1nteresting.io in server.conf (and in all other places where the domain name is used.

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