Bug Fix: Remove ipv6 binding from nginx config if ipv6 is not available.

docker/init/03-init-dispatcharr.sh

@@ -29,9 +29,17 @@ if [ "$(id -u)" = "0" ] && [ -d "/app" ]; then
         chown $PUID:$PGID /app
     fi
 fi
-
+# Configure nginx port
 sed -i "s/NGINX_PORT/${DISPATCHARR_PORT}/g" /etc/nginx/sites-enabled/default
 
+# Configure nginx based on IPv6 availability
+if ip -6 addr show | grep -q "inet6"; then
+    echo "✅ IPv6 is available, enabling IPv6 in nginx"
+else
+    echo "⚠️  IPv6 not available, disabling IPv6 in nginx"
+    sed -i '/listen \[::\]:/d' /etc/nginx/sites-enabled/default
+fi
+
 # NOTE: mac doesn't run as root, so only manage permissions
 # if this script is running as root
 if [ "$(id -u)" = "0" ]; then