make IPv6 optional during install

install/config/docker-compose.yml

@@ -60,4 +60,4 @@ networks:
   default:
     driver: bridge
     name: pangolin
-    enable_ipv6: true
+{{if .EnableIPv6}}    enable_ipv6: true{{end}}

install/input.txt

@@ -1,6 +1,7 @@
 docker
 example.com
 pangolin.example.com
+yes
 admin@example.com
 yes
 admin@example.com

install/main.go

@@ -39,6 +39,7 @@ type Config struct {
 	BadgerVersion             string
 	BaseDomain                string
 	DashboardDomain           string
+	EnableIPv6                bool
 	LetsEncryptEmail          string
 	EnableEmail               bool
 	EmailSMTPHost             string
@@ -303,6 +304,7 @@ func collectUserInput(reader *bufio.Reader) Config {
 	fmt.Println("\n=== Basic Configuration ===")
 	config.BaseDomain = readString(reader, "Enter your base domain (no subdomain e.g. example.com)", "")
 	config.DashboardDomain = readString(reader, "Enter the domain for the Pangolin dashboard", "pangolin."+config.BaseDomain)
+	config.EnableIPv6 = readBool(reader, "Is your server IPv6 capable?", true)
 	config.LetsEncryptEmail = readString(reader, "Enter email for Let's Encrypt certificates", "")
 	config.InstallGerbil = readBool(reader, "Do you want to use Gerbil to allow tunneled connections", true)