Wow this could not be more different from my experience trying the same.
I ran nextcloud in docker-compose for 2 years, with nginx doing SSL termination in front. Granted I wasn't using the official image; I use the linuxserver.io releases for all my other services so I use them for this, too. Nextcloud's config is all in the DB, except for database and cache connection information in a single config file. PHP's config is in a separate file and some env vars (eg timezone).
I've recently moved it into my home k3s cluster (yeah, i'm one of those people), which means traefik is my new reverse proxy. Works fine. I found I can get traefik to do the DAV redirects at least with the k8s Ingress config, but I don't need to since the linuxserver image includes the redirects in its' nginx configuration.
I ran nextcloud in docker-compose for 2 years, with nginx doing SSL termination in front. Granted I wasn't using the official image; I use the linuxserver.io releases for all my other services so I use them for this, too. Nextcloud's config is all in the DB, except for database and cache connection information in a single config file. PHP's config is in a separate file and some env vars (eg timezone).
I've recently moved it into my home k3s cluster (yeah, i'm one of those people), which means traefik is my new reverse proxy. Works fine. I found I can get traefik to do the DAV redirects at least with the k8s Ingress config, but I don't need to since the linuxserver image includes the redirects in its' nginx configuration.