Modify nginx to have a higher query timeout (seems 60s atm)

[Venryx]

This task would be reasonably straightforward to achieve with access to the full NGINX configuration syntax. This is not currently possible using nginx-gateway-fabric, however: nginxinc/nginx-gateway-fabric#2417

So to achieve this right now would probably require some unusual hack, eg. a Kubernetes sidecar that modifies the NGINX configuration files in the live pod, then triggers it to restart. This is messy though because it may have conflicts with the regular pathway that nginx-gateway-fabric uses for updating its config based on the higher-level configuration contents.

So it may be best to just wait until nginx-gateway-fabric implements the configuration "snippets" feature.