Update install.func

misc/install.func

@@ -127,6 +127,7 @@ network_check() {
   # DNS resolution checks for GitHub-related domains (IPv4 and/or IPv6)
   GITHUB_HOSTS=("github.com" "raw.githubusercontent.com" "api.github.com")
   GITHUB_STATUS="GitHub DNS:"
+  DNS_FAILED=false
 
   for HOST in "${GITHUB_HOSTS[@]}"; do
     RESOLVEDIP=$(getent hosts "$HOST" | awk '{ print $1 }' | grep -E '(^([0-9]{1,3}\.){3}[0-9]{1,3}$)|(^[a-fA-F0-9:]+$)' | head -n1)