New Nginx templates don't work in Docker container

Related to !2623 (merged). New changes to nginx templates don't work for Docker container behind reverse proxy. This appears to be a missing host (funkwhale-front). This occurs in both the Docker template and the reverse-proxy template.

Steps to reproduce

1. Upgrade to 0c2f9c8d or later
2. Restart the container

What happens?

The container fails to start due to an nginx error.

What is expected?

The container should start as expected.

Context

Funkwhale version(s) affected: 1.3.4+git.0c2f9c8d

nginx: [emerg] host not found in upstream "funkwhale-front" in /etc/nginx/conf.d/default.conf:75