Add Customizable Resolver

[MeCJay12]

Is your feature request related to a problem? Please describe.
I've recently enabled IPv6 on my docker environment and since then I get intermittent 502 errors on my sites. Digging into it, I found out that /etc/nginx/conf.d/include/resolvers.conf was being auto-populated with the docker v4 dns server plus two public ipv6 resolvers. Once I mounted my own resolvers.conf (read-only) file with just the docker v4 dns everything went back to normal. I know that I could go through and add the resolver line in the advance config of each host but that's a pain.

Before: resolver 127.0.0.11 [2001:4860:4860::8888] [2001:4860:4860::8844] valid=10s;
After: resolver 127.0.0.11 valid=10s;

Describe the solution you'd like
I suggest the default be the docker v4 dns server. That seems like the solution most people would want. If not, maybe a global setting to override the default resolver.

Describe alternatives you've considered
I mounted my own resolvers.conf file over the default; read-only so that NPM can't re-write it. I could also add my resolver config line to each host in the advance section but that would be a pain.

Additional context
N/A

[github-actions]

Issue is now considered stale. If you want to keep it open, please comment 👍