Update Nginx configuration to replace $http_host with $host$is_request_port$request_port for better compatibility

[nemchik]

Requires: #622

Needs alpine 3.24 rebase for nginx 1.29.3 or higher (alpine 3.24 has nginx 1.30.3)

First commit switched from $http_host to $host:$server_port but this breaks when standard ports (80/443) are used.

From FonduemangVI on Discord

empty: HTTP/3. QUIC/h3 requests carry :authority instead of a Host header, and nginx's $http_host (raw header) can come back empty on h3 connections — known nginx QUIC behaviour. $host is the safe variable (falls back to :authority/server_name).

This misses the need for handling non-standard ports (ex: 8443) for the users that do that.

nginx has some variables to solve it though:

• https://nginx.org/en/docs/http/ngx_http_core_module.html#var_is_request_port
• https://nginx.org/en/docs/http/ngx_http_core_module.html#var_request_port

$host$is_request_port$request_port is the current recommended solution.

I do not run proxy auth currently, so I have not tested those changes.

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