Fixed generation of resolvers.conf.

This fixes scenarios where `resolv.conf` generated by dhcpcd has a nameserver with `%interface` appended to its IPv6 address.
For example, a line like this must be properly handled:
nameserver fe80::7747:4aff:fe9a:8cb1%br0

rootfs/etc/cont-init.d/nginx-proxy-manager.sh

@@ -64,7 +64,7 @@ then
 fi
 
 # Generate the resolvers configuration file.
-echo resolver "$(awk 'BEGIN{ORS=" "} $1=="nameserver" {print ($2 ~ ":")? "["$2"]": $2}' /etc/resolv.conf);" > /config/nginx/resolvers.conf
+echo resolver "$(awk 'BEGIN{ORS=" "} $1=="nameserver" { sub(/%.*$/,"",$2); print ($2 ~ ":")? "["$2"]": $2}' /etc/resolv.conf);" > /config/nginx/resolvers.conf
 
 # Hnandle IPv6 settings.
 /opt/nginx-proxy-manager/bin/handle-ipv6-setting /etc/nginx/conf.d