nginx_proxy: Support extra user-defined network ports and http block configuration

[BlackHoleFox]

So in summary, the commits here provide two new features in the NGINX proxy:

1. Add 5 customizable ports that can used to bind extra servers within the existing share/nginx_proxy/ customization.
2. Add a new customization file that allows users to put statements inside the default http block

My use case is making a specific server to re-serve a home assistant integration's URLs in a more protected manner. By having a dedicated server block and port, I can be sure no unintended locations are reachable from it and also apply more external firewall rules with the added separation.

As far as I can tell, there's no way to dynamically apply a container:host port mapping to an addon, so multiple unused and default-off mappings were added to allow a reasonable amount of flexibility for users going onward.

I'd also like to apply rate limiting to custom NGINX server blocks, which needs a limit_req_zone statement inside of the top-level http context to work in order to work.

Both commits tested in my local HAOS deployment and seems to work fine.

UI Examples

Considered Alternatives

• Use the same domain and port by putting new config data in /share/nginx_proxy_default*.conf? In my use case, there's no way to then stop the location / block from running if my new location doesn't match, which is a problem.
• Use a different domain and listen on 443 as well? SNI-based routing makes this a non-starter.
• Use the existing tcp/80 mapping with your own external port? Using this port results in TLS errors because it attempts to redirect HTTPS traffic to a HTTP listener.
• Fork the addon long term? This is a hassle to maintain and keep up to date with the upstream source here, and I'm sure there's someone else who has wanted functionality like this.....

[home-assistant[bot]]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks :+1:

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