Feature: Nginx: Allow to specify listen options

[JulesdeCube]

Motivation

All OneUptime's services are now ipv6 friendly except Nginx that still listen only on IPv4. This PR finish the work done on #1773 and #1807.

Description

This PR allow to modify nginx's listen address and options to be able to listen on dual and ipv6 only network stack.

It introduce the NGINX_LISTEN_ADDRESS and NGINX_LISTEN_OPTIONS environmental variable inside the nginx configuration template so modify both parameter.

This PR don't change the current behaviors.

Example

IPv6 only:

NGINX_LISTEN_ADDRESS=[::]:
NGINX_LISTEN_OPTIONS=

dual stack:

NGINX_LISTEN_ADDRESS=[::]:
NGINX_LISTEN_OPTIONS=ipv6only=off

Pull Request Checklist:

• Please make sure all jobs pass before requesting a review.
• Put closes #XXXX in your comment to auto-close the issue that your PR fixes (if such).
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• Did you write tests where appropriate?

Related Issues

#1348
#1773
#1807

[simlarsen]

Correct me if I'm wrong, but I believe you need to have these env var in docker-compose, config.env, helpers.tpl etc.