fix: Use `parseBool` to parse boolean strings

nginx.tmpl

@@ -92,7 +92,7 @@
 upstream {{ .Upstream }} {
 	{{ $server_found := false }}
 	{{ range $container := .Containers }}
-        {{ $debug := (eq (coalesce $container.Env.DEBUG $debug_all "false") "true") }}
+        {{ $debug := parseBool (coalesce $container.Env.DEBUG $debug_all "false") }}
         {{/* If only 1 port exposed, use that as a default, else 80 */}}
         {{ $defaultPort := (when (eq (len $container.Addresses) 1) (first $container.Addresses) (dict "Port" "80")).Port }}
         {{ $port := (coalesce $container.Env.VIRTUAL_PORT $defaultPort) }}
@@ -229,7 +229,7 @@ proxy_set_header Proxy "";
 
 {{ $access_log := (or (and (not $.Env.DISABLE_ACCESS_LOGS) "access_log /var/log/nginx/access.log vhost;") "") }}
 
-{{ $enable_ipv6 := eq (or ($.Env.ENABLE_IPV6) "") "true" }}
+{{ $enable_ipv6 := parseBool (coalesce $.Env.ENABLE_IPV6 "false") }}
 server {
 	server_name _; # This is just an invalid value which will never trigger on a real hostname.
 	server_tokens off;