nginx: Increase startup timeout to 180 seconds

Nginx might take a while to start up, especially during startup or under
high load, and restarts can cause adverse effects in secondary units.
Raising this number makes us more lenient in these cases.

service/nginx/quadlet/nginx.container

@@ -16,6 +16,7 @@ Volume=nginx-conf:/etc/nginx/conf.d:z
 Volume=letsencrypt-certificates:/etc/ssl/private:z,rshared,ro
 
 [Service]
+TimeoutStartSec=180
 Restart=on-failure
 ExecReload=/bin/podman exec %N nginx -s reload