IPv6 link local interface scoped address breaks nginx config load

[Rycieos]

Related: #938

My host's /etc/resolv.conf looks like this:

# Generated by NetworkManager
search mydomain.net
nameserver 192.168.1.1
nameserver fe80::728b:cdff:fe86:a470%enp2s0
nameserver 2601:some:vlid:ipv6:addr::1

Which gets copied into the container.
Because of this:

nginx-proxy/docker-entrypoint.sh

Lines 22 to 23 in 3cbc541

	# Compute the DNS resolvers for use in the templates - if the IP contains ":", it's IPv6 and must be enclosed in []
	export RESOLVERS=$(awk '$1 == "nameserver" {print ($2 ~ ":")? "["$2"]": $2}' ORS=' ' /etc/resolv.conf | sed 's/ *$//g')

they get copied into the nginx.conf

When nginx loads it, it fails, and enters a restart loop:

dockergen.1 | 2020/04/19 19:19:15 Running 'nginx -s reload'
dockergen.1 | 2020/04/19 19:19:15 Error running notify command: nginx -s reload, exit status 1
nginx.1    | 2020/04/19 19:19:46 [emerg] 31#31: invalid IPv6 address in resolver "[fe80::728b:cdff:fe86:a470%enp2s0]" in /etc/nginx/conf.d/default.conf:36

It seems that nginx can't use an address of the form [ipv6%interface].

I have a work around like so:

export RESOLVERS=$(echo ${RESOLVERS} | sed 's/\[[a-f0-9:]*\%[a-zA-Z0-9]*\] //')

which removes the entry entirely. But maybe there is a way to fix it without removing it?