Cannot resolve IPv6

[shastaxc]

I'm running in Kubernetes with image docker.io/qgis/qgis-server:3.44.10.

Every request that comes in first tries to resolve localhost to an IPv6 address (which fails), then falls back to an IPv4 address (which succeeds). I was able to fix it by overwriting this file https://github.com/qgis/qgis-docker/blob/main/server/conf/qgis-server-nginx.conf#L92

Changing localhost to 127.0.0.1 forces it to skip the IPv6 resolution step. I think this should be the default value in this config instead of localhost. The landing page config file has the same issue (/etc/nginx/qgis.d/landing-page.conf).

[shastaxc]

Though on that note, when running with the nginx process within the same container as the fastcgi process, it could communicate with it using a unix socket instead, bypassing a bunch of network steps and potentially increasing speeds by 10-15%. I understand wanting to support the other use case where people run an external nginx server, in which case you don't want to use the unix socket, but these 2 modes could be configurable via environment variables.